542 AQUATIC PHYCOMYCETES 



Chytriomyces spinosus Fay 



Mycologia, 39: 152, figs. 1-39. 1947 



(Fig. 32 D, p. 554) 



"Zoosporangia hyaline, predominantly broadly pyriform, 11.3-45 

 X 11.3-40.5 [x, operculum apical, shallow saucer-shaped, 2.3-6 x 

 0.75-4.5 [i, and apiculate 1.5 x 6.9 \x, wall of sporangium 0.75-1.5 (x 

 in thickness, covered with numerous, abruptly tapering spines, usually 

 simple and solid, 2.5-4.9 x 1.4-5.9 jx, rarely bifurcate, occasionally 

 abortive and peg-like. Rhizoids branched, arising usually from a single 

 main axis, 1.6-3.6 [x diameter and extending to a distance of 387 [x. 

 Zoospores emerge and swarm 1-7 minutes in a hyaline vesicle before 

 escaping and swimming away; vesicle continuous with the sporangium. 



"Resting spores predominantly ovoid and 15-33 x 10-33.5 jx or 

 wedge-shaped and 15 X 1 5 \x, rarely spherical ; usually covered irregu- 

 larly with spines which may be simple or bifurcate; wall hyaline or 

 slightly yellowish, 1.4-4.5 u, in thickness; containing a single large oil 

 globule 6.8 to 21 ;x in diameter. Resting spores function as prosporangia 

 in germination, giving rise to hyaline subspherical thin-walled, smooth 

 secondary sporangia 8.9 to 20.6 [x diameter" (Fay, be. cit.). 



Cellulose substratum, soil, Fay (be. cit.), onion skin, from moist soil, 

 Karling (1947d, figs. 41-42; 1948c: 509), United States. 



The illustrations of resting-spore germination given (Fay, be. cit., 

 figs. 38-39) suggest parasitism by another chytrid. The germ sporangium 

 is very disproportionate in size to the resting spore, residual oil material 

 is left in the resting spore, and no operculum is mentioned or figured. 



Chytriomyces lucidus Karling 



Bull. Torrey Bot. Club. 76: 353. figs. 6-17. 1949 



"Sporangia hyaline, smooth, non-apophysate, usually flattened and 

 elongated transversely to rhizoidal axis, 18-44 < 28-66 jx, often almost 

 hemispherical, or reniform, with one low, 3-4 jx high by 6-15 jx broad, 

 apical exit papilla; operculum very shallow saucer-shaped, 4-8 u. diam., 

 usually non-persistent. Zoospores slightly oval, 5.8 x 6.2 [x, with a large 

 hyaline, spherical, 3.6-3.9 [x, refractive globule. Rhizoids coarse, rigid 

 and stiff-looking, main axes 4-12 jx in diam., often extending for a 



