. Bulletin of the British Museum (Natural History) Botany. 240 D. L. HAWKSWORTH. Fig. 27 Monocillium state of Niesslia cladoniicola (CBS ). Reproduced from Hawksworth (19756 : 195). Colonies only known in pure culture, growing rather slowly, pale rose, marginate; mycelium mainly superficial, hyphae flexuose, relatively thick-walled, hyaline, 1-5-2-5 urn wide. Conidio- phores macronematous, mononematous, hyaline, erect, unbranched. Conidiogenous cells phialidic, orthotopic, discrete, terminal, subcylindrical, the lower part somewhat swollen and with a thickened refractive wall, becoming n
. Bulletin of the British Museum (Natural History) Botany. 240 D. L. HAWKSWORTH. Fig. 27 Monocillium state of Niesslia cladoniicola (CBS ). Reproduced from Hawksworth (19756 : 195). Colonies only known in pure culture, growing rather slowly, pale rose, marginate; mycelium mainly superficial, hyphae flexuose, relatively thick-walled, hyaline, 1-5-2-5 urn wide. Conidio- phores macronematous, mononematous, hyaline, erect, unbranched. Conidiogenous cells phialidic, orthotopic, discrete, terminal, subcylindrical, the lower part somewhat swollen and with a thickened refractive wall, becoming narrowed above, 25-37 urn long, 1-7-2-2 urn wide at the base and 0-7-1-2 urn wide at the apex. Conldia ellipsoid to subcylindrical, adhering in slimy heads, hyaline, simple, rounded at the apices, smooth- and thin-walled, 4-6 x 2-2-4 um. Chlamydospores absent. Host: Cladonia rangiformis Hoffm., aged podetia. Distribution: British Isles. Known only from the type collection. Observations: The Monocillium imperfect state was obtained from the culture of single ascospores, and has not yet been found growing on lichens in the field. This state is included here, because since the perfect state is lichenicolous, the imperfect state is also presumably able to grow on lichens and consequently may be encountered in the future. The imperfect state has not been accorded a separate binomial as this appears superfluous when it is unknown to occur in nature. Niesslia cladoniicola forms black superficial setose perithecia 100-150 urn diam and produces 1-septate hyaline ascospores 4-5-8 x 1-5-2 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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