Phylum：Chytridiomycota　>>　Class： Chytridiomycetes　>>　 Order： Chytridiales 
   
 
　BCRC Number： NO BCRC Number!  
   
　Scientific Name： Allochytridium expandens
 
   
   
　Author：

Allochytridium expandens Salkin, Amer. J. Bot. 57:649. 1970.
   
 
 
 
 
　Description： On 1/4YpSs agar: Sporangium generally irregularly globose, 55-85 μm in diameter, ellipsoidal to sac-like, 50 × 65 μm, with one to three rhizoid axes and a discharge tube. The tip of the tube appears gelatinous and a wall, which is destined to become the operculum. Zoospores are discharged at the end of the discharge tube in a vesicle, and 1-2 min later, the zoospores become active and swim away. Actively swimming zoospores are globose, 5-7 μm in diameter, with a lipid globule; soon become amoeboid while still actively swimming. The operculum is conspicuous, as a saucer-shaped lid to one side of the discharge tube. The zoospore cyst spherical; contents of cyst move through the germ tube into the expanding sporangium; the empty cyst remains attached to the wall of the mature sporangium. Rhizoids arise from one or several points on the sporangium, extensively branched and taper irregularly, often with tightly constricted points to fine ends. Resting spore never observed on agar. Color of colony yellowish brown.
 
 
 
 
 
　Specimens：

Taiwan. Yilan: Shunglienpyi, water of pond, 3 Oct. 1992, NTNU 601d. Isolated on grass leaves from water.
 
 
 
　Habitat： Fresh water.
 
 
 
　Distribution：

USA, Japan, Taiwan.
 
 
 
　References：

Barr, DJS. 1986; Chen, SF and Chien, CY. 1995; Salkin, IF. 1970.
   
   
   
　Provided：

S. F. Chen
 
 
　Note： The thallus development is similar to the Entophlyctis type, saprophytic on a cellulose substrate, similar to Salkin's (1970) and Barr's (1986) descriptions. Resting spores are formed in older liquid 1/4YpSs culture, about 30 μm in diameter, with smooth, thick wall.