. Bulletin of the British Museum (Natural History). Botany; Botany. 26 D. L. HAWKSWORTH ? *. Fig. 12 Keissleriomyces sandstedeanus (W 1921/185—holotype), vertical section of pycnidium (x 1020). mature, not markedly guttulate, contents rather granular, smooth-walled, 18-22 x 3-5—5 //m. Host: Cladonia furcata (Huds.) Schrader, podetia. In the type material the pycnidia are mainly located on the upper part of the podetia, the infected part of which is slightly decolourized but not deformed. Keissleriomyces sandstedeanus consequently appears to be only a weak parasite or opportunist. Distribution:
. Bulletin of the British Museum (Natural History). Botany; Botany. 26 D. L. HAWKSWORTH ? *. Fig. 12 Keissleriomyces sandstedeanus (W 1921/185—holotype), vertical section of pycnidium (x 1020). mature, not markedly guttulate, contents rather granular, smooth-walled, 18-22 x 3-5—5 //m. Host: Cladonia furcata (Huds.) Schrader, podetia. In the type material the pycnidia are mainly located on the upper part of the podetia, the infected part of which is slightly decolourized but not deformed. Keissleriomyces sandstedeanus consequently appears to be only a weak parasite or opportunist. Distribution: Czechoslovakia. Only known from the type collection. Observations: The characteristic polyphialides are otherwise unknown amongst the lichenicolous Coelomycetes, and no other fungus forming similar spores is recorded from any Cladonia species. VIII. LAEVIOMYCES D. Hawksw. gen. nov. Genus lichenicola ad Coelomycetes Sphaeropsidales pertinens. Conidiomata singularia, pycnidiifor- mia. uniloculata, dispersa, subglobosa vel irregularia, erumpescentia, nigra, cum muris plusminusve hyalinis e cellulis pseudoparenchymaticis (sed in unica textura intricatis) et ostiolis irregulariter dchiscentibus. Conidiophora desunt. Cellulae conidiogenae holoblasticae, acrogenae, subcylindrices vel elongato-ampulliformes, prolifericae, annellatae, fuscae vel brunneae, laeves. Conidia subglobosa ad ellipsoidea, basi truncata, pallide brunnea, simplicia, laevia. Conidiomata pycnidial, arising singly, uniloculate, scattered, subglobose or irregular with somewhat convoluted internal walls, erumpent, black; walls composed of several layers of irregularly polyhedral to subglobose ± hyaline cells forming a textura angularis (but in one species reduced and hyphal, textura intricata); ostiole irregular in shape and gaping in age. Conidiophores absent. Conidiogenous cells holoblastic, lining the inner wall of the pycnidial cavity, acrogenous, subcylindrical to elongate-ampulliform, proliferating, annell
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