876 AQUATIC PHYCOMYCETES 



Coker (1923) and Kevorkian (1935) describe the oogonium as lacking 

 periplasm. In the development of the sex organs of Apodachlya brach- 

 ynema Coker observed that the future antheridial cell reached its mature 

 size before the oogonium appeared. The latter was then formed by the 

 enlargement of a small globular outgrowth produced at the apex of the 

 antheridium (see "Sexual Reproduction," p. 856). 



KEY TO THE SPECIES OF APODACHLYA 



Oospore smooth-walled, not punctate 



Sporangia, if formed, developed singly or in clusters, not in basipetal 

 succession 

 Oogonia borne at the tips of short moniliform segments; zoo- 

 spores, if present, rarely encysting at the orifice of the spo- 

 rangium 

 Antheridium the suboogonial cell; sporangia formed in abun- 

 dance A. brachynema, p. 876 



Antheridium borne on a short lateral outgrowth beneath the 



oogonium; sporangia rarely formed A. minima, p. 878 



Oogonia borne at the tips of the main axes, occasionally laterally, 

 subtended by an antheridial cell ; zoospores generally encyst- 

 ing at the orifice of the sporangium A. pyrifera, p. 879 



Sporangia developed in basipetal succession or singly. . A. seriata, p. 880 

 Oospore wall minutely punctate A. punctata, p. 880 



Apodachlya brachynema (Hildebrand) Pringsheim 



Berichte Deutsch. Bot. Gesell., 1 : 289. 1883 



(Fig. 69 C, I-K, p. 875) 



Leptomitus brachynema Hildebrand, Jahrb. wiss. Bot., 6: 261, pi. 16, figs. 



12-23. 1867-68. 

 Apodya brachynema (Hildebrand) Cornu, Ann. Sci. Nat. Bot., V, 15: 14. 



1872. 



Mycelium branched, the segments 20-185 u. long by 4-23 u. in 

 diameter, generally becoming shorter near the sporangia, the lateral 

 branches mostly distal, often moniliform; sporangia terminal, single 



of same fungus emerging from cyst; K, secondary zoospore; flagella are not 

 shown, but are laterally inserted. 



(A-B, Pringsheim, 1860; C, I-K, Coker, 1923; D, Coker and Leitner, 1938; 

 E, Zopf, 1888; F, Indoh, 1939) 



