TREMELLALES 



289 



are very much like the primary basidiospores except for their 

 slie^htly smaller size; in Exidia the secondary basidiospores are 

 sickle-shaped and may be multicellular. 



Fig. 113. Tre77iella viesenterica. A. Hypobasidium initial, showing binu- 

 cleate condition. B. Hypobasidium in which fusion of nuclei has occurred. 

 C. Large hypobasidium containing mature fusion nucleus. D. Two daughter 

 nuclei resulting from first nuclear division. E. Four-nucleate hypobasidium 

 with four epibasidia in process of formation; the hypobasidium has become 

 cruciately four-celled. F. Further development of epibasidia with nuclei 

 beginning to migrate into epibasidia. G. Migration of nuclei into spores 

 formed at apex of sterigma; the epibasidia project above the surface of the 

 jelly-like tissue. H. iMature secondary spore. /. Binucleate hyphal seg- 

 ment. /. Hyphal tip bearing conidia. (Adapted from Whelden.) 



The family Hyaloriaceae contains a single genus, Hyaloria, of 

 which the best-known species is H. pilacre, described from 

 Brazil by Moller (1895). The fruiting body is small and glassy 

 in appearance and consists of a stalk bearing a head, thus re- 

 sembling an imopened mushroom or the discomvcetous Leotia. 

 The basidia are angiocarpous, being borne internally in a dome- 



