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Knudsen, K. 2003: Literature reviews and remarks. - Bulletin of the California Lichen Society 10(1): 13-14.
Knudsen, K 2003: Texosporium sancti-jacobi (Ascomycetes: Caliciales: Caliciaceae). New finds and general obervations. - Crossosoma 28(1): 9-12.
Knudsen, K. 2003: Three notable lichen collections and their relationship to lichen distributions in Southern California. - Crossosoma 29(1): 37-40.
Knudsen, K 2003: Type specimens: investigations and observations. - Bulletin of the California Lichen Society 10(2): 36-38.
Knudsen, K 2004: A preliminary study of Acarospora smaragdula var. lesdainii in California. - Opuscula Philolichenum 1: 21-24.
Knudsen, K 2004: A study of Acarosporas in the lichen flora of the Santa Cruz Peninsula by A. W. C. T. Herre. - Bulletin of the California Lichen Society 11(1): 10-15.
Knudsen, K. 2004: Lichen Flora of the Greater Sonoran Desert Region, Volume II. - Crossosoma 39(1): 32-33.,
Knudsen, K 2004: T. H. Nash III et al. Lichen Flora of the Greater Sonoran Desert Region, Vol. II. 742 pp. Lichens Unlimited, Arizona State University, Tempe. 2004. - Bulletin of the California Lichen Society 11(2): 45-47.
Knudsen, K 2005: Acarospora amphibola Wedd. in Boston Harbor. - Evansia 22(2): 43-45.
Knudsen, K 2005: Acarospora epilutescens rediscovered. - Opuscula Philolichenum 2: 11-13.
Knudsen, K. 2005: Pope, R.: Lichens Above Treeline: A Hiker's Guide to Alpine Zone Lichens of the Northeastern United States. University Press of New England, Hanover and London. 80 pages. 110 color photographs. 2005. - The Bryologist 108(4): 619.
Knudsen, K 2005: Lichens of the Santa Monica Mountains, Part One. - Opuscula Philolichenum 2: 27-36.
Knudsen, K. 2005: Notes on the lichen flora of California #1. Pleopsidium chlorophanum and Acarospora scabrida. - Bulletin of the California Lichen Society 12(2): 33-34.
Knudsen, K 2005: Polysporina lapponica in Southern California. - Opuscula Philolichenum 2: 17-19.
Knudsen, K 2005: L. B. Sparrius. A Monograph of Enterographa and Sclerophyton. Bibliotheca Lichenologica 89. pp. 141. 2004. - Opuscula Philolichenum 2: 54.
Knudsen, K 2005: O. Gilbert. The Lichen Hunters. 207 pp. The Book Guild, Great Britain. 2004. - Bulletin of the California Lichen Society 12(1): 9-10.
Knudsen, K 2005: R. E. Showman & D. G. Flenniken. The Macrolichens of Ohio. Ohio Biological Survey Bulletin, New Series, Vol. 14 (3): 279 pp. Ohio Biological Survey. 2004. - The Bryologist 108(2): 341.
Knudsen, K. 2005: The carbonate lichen flora of Cactus Flats in the San Bernardino Mountains, San Bernardino County, California, USA. - Crossosoma 31(1): 13-24.
Knudsen, K. 2006: Acarospora obpallens (Nyl. ex Hasse) Zahlbr. in the southeastern United States. - Evansia 23(1): 9-10.
Knudsen, K. 2006: Notes on the lichen flora of California #2. - Bulletin of the California Lichen Society 13(1): 10-13.
Knudsen, K. 2006: Notes on the lichen flora of California #3. - Bulletin of the California Lichen Society 13(2): 37-38.
Knudsen, K. 2006: Tucker, S. C.; Ryan, B. D.: Revised catalog of lichens, lichenicoles, and allied fungi in California. Constancea 84. Jepson Herbarium, University of California, Berkeley. - Bulletin of the California Lichen Society 13(1): 14-15.
Knudsen, K. 2006: Tucker, S. C.; Ryan, B. D.: Revised catalog of the lichens, lichenicoles, and allied fungi in California. Constancea 84. 275 pages + bibliography. 2006. - The Bryologist 109(4): 587-588.
Knudsen, K. 2007: McCune, B.; Rosentreter, R.: Biotic Soil Crust Lichens of the Columbia Basin. Monographs in North American Lichenology. No. 1, Northwest Lichenologists Ltd., Corvallis. 105 pages. 2007. - The Bryologist 110(3): 563-564.
Knudsen, K. 2007: Kocourková, J.: Lichenicolous Fungi of the Czech Republic (The First Commented Checklist). Acta Musei Nationalis, Prague. Sborník Nárosního Muzea v Praze. Series B-Historia Naturalis 55(3-4), pp. 59-167. 1999 [2000]. - Opuscula Philolichenum 4: 81.
Knudsen, K. 2007: Lichenicolous fungi. - Bulletin of the California Lichen Society 14(1): 1-3.
Knudsen, K. 2007: Acarospora smaragdula in North America. - Evansia 24(4): 94-96.
Knudsen, K. 2007: Acarospora. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 1-38.
Knudsen, K. 2007: An annotated checklist of the lichens of the Santa Monica Mountains. - In: D. A. Knapp: Proceedings of the 32nd Annual Southern California Botanists Symposium. Southern California Botanists Special Publication, No. 4. Fullerton, pp. 35-62.
Knudsen, K. 2007: Myriospora. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 254-255.
Knudsen, K. 2007: Pleopsidium. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 274-276.
Knudsen, K. 2007: Polysporina. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 276-278.
Knudsen, K. 2007: Texosporium sancti-jacobi, a rare endemic lichen of western Northern America: is it evanescent under drought conditions?. - Bulletin of the California Lichen Society 14(2): 33-36.
Knudsen, K. 2008: Endococcus janae, a new species from Peru on Acarospora rhabarina. - Opuscula Philolichenum 5: 25-28.
Knudsen, K. 2008: Acarospora fuscescens (Acarosporaceae), a Little Known Species pf Western North America. Evansia 25 (4): 82-84.
Knudsen, K. 2009: Caloplaca obamae, a new species from Santa Rosa Island. Opuscula Philolichenum 6: 37-44.
Knudsen, K. & J. A. Elix, 2007: A new Lepraria (Stereocaulaceae) from the Santa Monica Mountains in southern California. - The Bryologist 110(1): 115-118.
K. Knudsen & J. A. Elix 2007: Lepraria. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 384-388.
K. Knudsen & J. A. Elix 2008: Acarospora stictica, a new yellow species containing stictic acid, from Mexico. - Opuscula Philolichenum 5: 49-52.
Knudsen, K., J.A. Elix, J.C. Lendemer. 2006: Two new records of Lepraria from California. - Bulletin of the California Lichen Society 13(1): 3-5.
Knudsen, K.. J. A. Elix, J.C. Lendemer. 2007: Lepraria adherens: a new species from North America. - Opuscula Philolichenum 4: 5-10.
Knudsen, K., J. A. Elix, V. Reeb 2008: A preliminary study of the genera Acarospora and Pleopsidium in South America. - Opuscula Philolichenum 5: 1-22.
Knudsen, K. & M.G. Halici 2009: Sarcogyne magnispora (Acarosporaceae), a new species in the nivea group from Turkey. Mycotaxon 107: 413-417.
Knudsen, K. & J. Kocourková 2007: Noteworthy collections. New records of lichenicolous fungi from California. - Crossosoma 33(1): 39-40.
Knudsen, K. & J. Kocourková 2008: A study of lichenicolous species of Polysporina (Acarosporaceae). Mycotaxon 105: 149-169.
Knudsen, K. & J. Kocourková 2008: Noteworthy Records, New Records of Lichen and Lichenicolous Fungi from California. Crossosoma 34 (1): 37-39.
Knudsen, K. & J. Kocourková 2009: The Lichens and Lichenicolous Fungi of the Point Loma Conservation Area, San Diego, USA. Evansia 26 (1): 24-29.
Knudsen, K., J. Kocourková & K. Etayo 2008: A new species of Sphaerellothecium (Mycosphaerellaceae) on Placidium lacinulatum. Opuscula Philolichenum 6: 41-44.
Knudsen, K. & K. A. Kramer 2007: The lichen flora of the San Jacinto Mountains: San Jacinto Wilderness Area, San Bernardino National Forest, Riverside County, California, USA. - Evansia 24(2): 42-47.
Knudsen, K. & T. La Doux. 2005: Lichen flora of the Southwestern Mojave Desert: Key's Ranch, Joshua Tree National Park, San Bernardino County, California, USA. - Evansia 22(3): 103-109.
Knudsen, K. & T. La Doux. 2006: Lichen flora of the southwestern Mojave Desert: Eureka Peak, Joshua Tree National Park, Riverside and San Bernardino County, California. - Evansia 23(2): 24-27.
Knudsen, K. & J.C. Lendemer. 2005: Changes and additions to the checklist of North American lichens — III. - Mycotaxon 93: 277-281.
Knudsen, K. & J.C. Lendemer. 2005: Changes and additions to the North American lichen flora. — IV.. - Mycotaxon 93: 289-295.
Knudsen, K. & J.C. Lendemer. 2006: Changes and additions to the North American lichen mycota — V. - Mycotaxon 95: 309-313.
Knudsen, K. & J.C. Lendemer. 2006: Cladonia firma in San Luis Obispo County, California. - Bulletin of the California Lichen Society 13(2): 29-34.
Knudsen, K. & J.C. Lendemer. 2006: Sarcopyrenia bacillosa (Nyl. ex Hasse) Nav.-Ros. & Hladun rediscovered in California. - Evansia 23(3): 66-67.
Knudsen, K. & J. C. Lendemer 2007: Cladonia firma, sponsorship for the CALS Conservation Committee. - Bulletin of the California Lichen Society 14(2): 40-44.
Knudsen, K. & J.C. Lendemer 2007: Ramonia. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 394-395.
Knudsen, K. & J.C. Lendemer 2007: Studies in lichens and lichenicolous fungi: notes on some North American taxa. - Mycotaxon 101: 81-87.
Knudsen, K. & J.C. Lendemer 2009: Naetrocymbe herrei (Peliosporales: Ascomycetes), a new lichenized saxicolous species from the coast of central California, U.S.A. Opuscula Philolichenum 6: 59-64.
Knudsen, K. & J.C. Lendemer 2009: Cladonia maritima, a new species in the C. cervicornis group from western North America. Opuscula Philolichenum 6: 121-124.
Knudsen, K., J.C. Lendemer & R.E. Riefner, Jr. 2005: Flavoparmelia subcapitata rediscovered in southern California. - Bulletin of the California Lichen Society 12(1): 1-2.
Knudsen, K. & H.T. Lumbsch. 2007: Thelocarpon. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 301-302.
Knudsen, K. & D. Magney. 2006: Rare lichen habitats and rare lichen species of Ventura County, California. - Opuscula Philolichenum 3: 49-52.
Knudsen, K. & C. Morse 2009: Acarospora nicolai (Acarosporaceae), a rediscovered species. The Bryologist 112 (1): 147-151.
Knudsen, K., T.H. Nash III, W.A. Iselin & S.M. Huggins 2008: The Lichens of Cuyamaca Rancho State Park, San Diego County, California. Bulletin of the California Lichen Society 15 (2): 43-49.
Knudsen, K. & B. Owe-Larsson. 2005: Miriquidica mexicana in Southern California. - Bulletin of the California Lichen Society 12(1): 7-8.
Knudsen, K. B. Owe-Larsson, J. A. Elix, J. C. Lendemer & J. Kocourková 2008: Lichens and lichenicolous fungi of the Santa Monica Mountains, Part 3: additions and corrections to the annotated checklist. - Opuscula Philolichenum 5: 53-60.
Knudsen, K. & B. D. Ryan 2007: Strangospora. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 299-301.
Knudsen, K. & S. M. Standley 2007: Sarcogyne. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 289-296.
Knudsen, K. & S. Werth 2008: Lichens of the Granite Mountains, Sweeney Granite Mountain Desert Research Center, southwestern Mojave Desert, San Bernardino County, California. - Evansia 25 (1): 15-19.
Carlberg, T. & K. Knudsen 2007: Sulcaria isidiifera, sponsorship from the CALS Conservation Committee. Bulletin of the California Lichen Society 14 (2): 45-47.
Kocourková, J. & K. Knudsen 2007: Noteworthy collections. New records of lichens and lichenicolous fungi from California. - Crossosoma 33(2): 70-73.
Kocourková, J. & K. Knudsen 2008: Four new Lichenicolous Fungi from North America. Evansia 25 (2): 62-64.
Kocourková, J. & K. Knudsen 2009: Gelatinopsis acaarosporicola (Helotiaceae), a new lichenicolous fungus on Acarospora socialis from western North America. The Bryologist 112 (2): 363-367.
Kocourková, J., K. Knudsen, J.C. Lendemer & A.M. Fryday 2008: New California Records of Lichens and Lichenicolous Fungi. Crossosoma 34 (1): 19-23.
Lendemer, J.C. & K. Knudsen 2007: Changes and additions to the North American lichen mycota—VI. - Proceedings of the Academy of Natural Sciences of Philadelphia 156: 55-57.
Lendemer, J.C. & K. Knudsen 2008: Ramonia vermispora, a new species from the Sonoran Desert region of southwestern North America. - Opuscula Philolichenum 5: 83-88.
Lendemer, J.C. & K. Knudsen 2008: Studies in lichens and lichenicolous fungi: further notes on North American taxa. - Mycotaxon 103: 75-86.
Lendemer, J.C. & K. Knudsen 2009: Two New Usnic Acid-Containing Species of Lecanora from Western North America. Opuscula Philolichenum 6: 73-80.
Lendemer, J.C., K. Knudsen & J.A. Elix 2008: Lepraria friabilis, a new species from Eastern North America. - Opuscula Philolichenum 5: 61-66. [RLL List # 210 / Rec.# 30141]
Lendemer, J.C., J. Kocourková & K. Knudsen 2008: Studies in lichens and lichenicolous fungi: notes on some taxa from North America. Mycotaxon 105: 379-386.
Lücking, R., K. Knudsen & A. M. Fryday 2007: Diploschistella. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 228-229.
Printzen, C. & K. Knudsen 2007: Placynthiella. - In: T. H. Nash, III, C. Gries and F. Bungartz: Lichen Flora of the Greater Sonoran Desert Region. Volume 3. Lichens Unlimited, Arizona State University, Tempe, pp. 391. [RLL List # 210 / Rec.# 30278]
Tucker, S. C., K. Knudsen, K., J. Robertson. 2006: Additional lichen collections from Pinnacles National Monument, San Benito County, California. - Bulletin of the California Lichen Society 13(1): 6-9.
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