1050 AQUATIC PHYCOMYCETES 



1.8-3 (i. in diameter; zoosporangium terminal on lateral branches, which 

 are unbranched or once or twice dichotomously branched, spherical or 

 ovoid, 20-34 by 18-28 u., proliferous, with an apical or lateral short 

 exit tube, 4.8-15 \x long by 4-6 u. wide; vesicle oblong-ovoid, with an 

 extremely delicate wall; zoospores reniform, with two lateral flagella; 

 oogonium and oospore unknown. 

 In decaying plants of Oryza sativa, Japan. 



EXCLUDED SPECIES OF PYTHIOGETON 

 * PYTHIOGETON STERILIS Hamid 



Proc. Indian Acad. Sci., Sect. B, 15: 212, pi. 3. 1942 



From the figures and description, this species appears based upon 

 abnormal sporangial material of Pythiogeton ramosum. 

 Twigs, India. 



DIASPORANGIUM Hohnk 



Beihefte Bot. Centralbl. 55 (Abt. A): 97. 1936 



(Fig. r 89 H, p. 1055) 



Mycelium composed of main hyphae and narrower branches; zoo- 

 sporangia regularly ellipsoidal, their long axes transverse to those of the 

 supporting hyphae, sometimes becoming thick-walled and resting; zoo- 

 spores rarely formed, laterally biflagellate, typically differentiated within 

 the sporangium before escape (no vesicle being formed) or sometimes 

 by division of the extruded naked protoplasm; sporangium occasionally 

 germinating by a germ tube; oogonium globose, with a single oospore 

 and central reserve globule; antheridia not observed. 



In soil. 



DIASPORANGIUM JONESIANUM Hohnk 



Beihefte Bot. Centralbl., 55 (Abt. A): 97, fig. 3. 1936 



Mycelium intra- and extramatrical, the former type more slender 

 than the latter, which is composed of hyphae 4-8 u. in diameter and up 

 to 4 cm. in length, branches arising at somewhat regular intervals as 

 whorls of two to five short slender hyphae, septate with age; zoosporan- 

 gia ellipsoidal, somewhat angular with age, borne transversely, usually 



