TREMELLALES 



521 



develop at variable heights above the substrate. Occasionally the 

 second septum fails to develop in them. 



In the higher forms, the hyphal tissue is waxy, membranous or cor- 

 iaceous and the basidia form smooth hymenia. Sebacina uvida (Exidi- 



opsis effusa) is also poorly developed. 

 The basidiospores germinate with 

 falcate conidia of the Auricidaria 

 type (Brefeld, 1888). Before basidia 

 develop, thick branches of the sub- 

 hymenial hyphae form special con- 

 idiophores which project above the 

 hymenium and cut off little heads of 



Fig. 339. Fig. 340. 



Fig. 339. — 1. Sebacina minor. Showing irregularly arranged basidia in hyphal tissue. 

 2. Heterochaete Sanctae-Catharinae. Section of fructification, showing portion of hymen- 

 ium. 3. Sebacina incrustans. Young hymenium, showing conidiophores. (1 X 180; 

 2 X 100; 3 X 270; after Brefeld, 1888, and Moller, 1895.) 



Fig. 340. — Sebacina ciliata (Exidiopsis ciliata). Habit. (Natural size; after Moller, 

 1895.) 



long, oval, conidia (Fig. 339, 3). In Sebacina (Bourdotia) gloeocys- 

 tidiata (Kuehner, 1926), caryogamy occurs in the young basidium 

 followed by meiosis and the formation of the usual septa. The basidio- 

 spores are uninucleate. Heterochaete Sanctae-Catharinae (Moller, 1895), 

 in Brazil, appears on tree trunks as resupinate, very thin, gelatinous 



