878 AQUATIC PHYCOMYCETES 



Differing from Apodachlya brachynema principally in having longer 

 sporangia and larger hyphae. As Coker (1923) suggests, this is probably 

 only a form rather than a variety. 



Apodachlya minima Coker and Leitner 



J. Elisha Mitchell Sci. Soc, 54: 313, pi. 39. 1938 



(Fig. 69 D, p. 875) 



"Mycelium flaccid and flocculent, reaching a diameter of 2.5-3 cm. 

 on hemp seed; main hyphae slender and segmented, branching from 

 any point on the segment, mainly from the middle; protoplasm thin 

 except in the oogonial branches, with small round refractive bodies 

 present; segments 3.4-8.5 .< 47.6-170 jj. on hemp seed, but 6-12.2 x 

 44-250 [x on 2 % corn meal agar, becoming shorter at the tips. Spo- 

 rangia unknown . . . [Various experiments to produce them were unsuc- 

 cessful.] Oogonia numerous, borne on the tips of short, moniliform, 

 often recurved, lateral branches, mainly spherical, occasionally short- 

 pyriform or oval or club-shaped or dumbbell-shaped, 12-1 6 ja thick; 

 wall unpitted, smooth, about 0.45 u. thick. Egg single, completely filling 

 the oogonium, excentric, the cytoplasm rounded up into a hyaline ball 

 closely appressed to the smaller hyaline oil droplet. Antheridium origi- 

 nating from the suboogonial cell as a lateral branch which grows out and 

 applies itself to the oogonial wall, variable in shape, usually becoming 

 completely empty before the maturation of the egg" (Coker and Leitner, 

 loc. cit.). 



In a stream slightly contaminated with sewage, substratum (?), 

 United States. 



Johnson (1955c) observed the zoosporangial stage of this species. 

 Whereas the sizes of the sporangia (17.6-26.2 by 12.8-17.6 \x) suggest 

 those of Apodachlya pyrifera, their arrangement is quite different. In 

 most instances they are produced in glomerules and only rarely singly. 

 Very few zoospores were found. These encysted at once upon emergence, 

 the cysts being 6.5-8.0 \x in diameter. 



