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Further Studies on Lichenized Fungi

Vernon Ahmadjian
The Bryologist
Vol. 67, No. 1 (Spring, 1964), pp. 87-98
DOI: 10.2307/3241190
Stable URL: http://www.jstor.org/stable/3241190
Page Count: 12
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Further Studies on Lichenized Fungi
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Abstract

Mycobionts of Hawaiian lichens in culture produced the same basic type of colonies as other lichen fungi and a variety of metabolic products. Most Hawaiian mycobionts formed gelatious sheaths around the hyphae and some excreted large amounts of viscous material into the culture medium. Phaeographina fulgurata formed abundant conidia which could not be related to those of free-living fungi. A study of five mycobionts revealed deficiencies for biotin and thiamine. Maltose and lactose were the most favored carbon sources for nine tested mycobionts. Attempts to synthesize a lichen from two Hawaiian mycobionts and a Trentepohlia phycobiont isolated from a lichen from Massachusetts, were partially successful. Seven hundred single-spore cultures of Cladonia cristatella mycobionts showed wide variations in form, size, and pigmentation, which indicated, for this lichen at least, a sexual mechanism including fusion of nuclei with different genetic factors. The presence of mating types was not detected and chemical tests showed that these fungi did not produce lichen substances. Pycnidia were formed by several species of Buellia mycobionts, but there is no direct evidence to support their suggested role in sexual reproduction.

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