108 



THE LOWER FUNGI— PHYCOMYCETES 



3. Zygochytrium Sorokin (Botan. Zeitung, 32: 305, 1874). 



This genus, based on the single species, Z. aurantiacum 

 Sorokin (Fig. 41), is known only from the original description 



Fig. 39. — Hypochytrium infestans Zopf in apothecia of Helotium. (a) Apothe- 

 cia. {h) Portion of apothecium in section showing swarmsporangia of the 

 parasite, (c, d) Intercalary and terminal swarmsporangia. {After Zopf 1884-) 



M)<fih 





Fig. 40.' — Tetrachylrium triceps Sorokin. (a) Swarmsporcs. {b) Con- 

 jugating gametes, (c) Zygote, {d) Germinating zygcjtes. {c) Immature 

 plant. (/) Mature plant with haustorial disc, {g) Sporangium escaping 

 from prosporangium; lid fallen away, {h) Free sporangium, {k) Sporangium 

 with four swarmsporcs. {v) Escape of swarmspores. {After Sorokin 1874-) 



and figures. If not founded on faulty observation it is an 

 extremely interesting form, bearing uniciliate swarmspores in 

 sporangia at the tips of a homothallic zygophore recalling that 

 of Sporodinia. 



