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Publisher Summary This chapter discusses the genus Agaricostilbum. It provides a systematic discussion of the species and concludes with comments on the genus. The diagnosis of the genus is done on the basis of asexual, sexual, physiology, and biochemistry, and phylogenetic placement. In asexual reproduction the statismospores germinate by budding. Monospore isolates presumably yield stable yeast states that propagate by budding. Multispore isolates typically also continue budding rather than becoming hyphal. In sexual reproduction Agaricostilbum species have small synnematoid basidiocarps. These arid white structures often occur in conspicuous clusters on dead, attached, or fallen palm litter or on an unknown species of Xanthorrhoea (Liliaceae) in the case of A.pulcherrimum. Agaricostilbum spp. differ from many other taxa with similar “simple” septal pores and Ustilago-like basidia in that septate basidia are formed directly, i.e., teliospores and distinct probasidia are absent, and each basidial cell buds off statismospores repeatedly as in Ustilago spp. and allied taxa. They also differ from other groups with similar basidia in important details of nuclear division. The statismospores give rise to stable yeast states on culture media. Details of mating are not yet known. |
