CHYTRIDIALES 587 



Saprophytic on rotting stems of Triticum vulgare, Butler (loc. cit.), 

 India; tissues of Typha (angustifolia?), Domjan (as Nowakowskiella 

 endogena; 1936:51, pi. 1, figs. 89, 98, 108-109, 112-124, 126-127, 

 133-136, 143-150, 156-159, 166, 168-169, 175-179), Hungary; rotting 

 oat leaves, Karling (1941b: 107), bleached grass leaves and cellophane 

 from moist soil, Karling (1948c: 510), Karling (1942c: 620), J. Roberts 

 (1948: 154, fig. 1), R. M. Johns (coram.), nucules of moribund Chara 

 sp., Sparrow and Barr (coll. Paterson) (1955:555), United States; 

 Karling (1944b: 384, fig. 69), Brazil; from soil, substrate ?, Gaertner 

 (1954b: 22), Egypt, South Africa. 



Preference is given to Karling's description because it is more com- 

 plete than Butler's. 



Domjan's fungus differs from Butler's only in that the resting spores 

 were occasionally somewhat angular. 



Butler (loc. cit.) described the development of the resting spores as 

 follows : "Certain hyphae commence to proliferate, either at their ends, 

 or laterally, growing out into large, irregular cells. New cells are formed 

 from these, both by proliferation, and by division of existing cells. In 

 this manner a thin-walled mass of angular cells is formed, sometimes 

 of considerable size. The marginal cells of this swell up into spherical 

 bodies, which thicken their walls to become resting spores. As the 

 process advances, the first formed cells are emptied of their contents, 

 which apparently go to form new cells. As a final result, a group of 

 resting spores is produced, joined together by the thin-walled paren- 

 chymatous tissue of the mass." This peculiar process was also observed 

 by Domjan (1936) and Karling (1944b) and by us. Karling remarked 

 that resting spores may originate from short lateral branches which 

 enlarge distally, divide, and form pseudoparenchyma. According to 

 J. Roberts (1948), the optimum temperature for growth in solid cellulosic 

 media is 16-18 degrees C. (see also "Cytology," p. 99). 



Nowakowskiella hemisphaerospora Shanor 

 Amer. J. Bot., 29: 174, figs. 1-38. 1942 

 (Fig. 36 D-F, p. 590) 

 "Rhizomycelium much branched, extensive, hyaline, filaments quite 



