94 



THE LOWER FUNGI— PHYCOMYCETES 



reported by Coker (1923: 186) from North America, and R. 

 ichneumon Gobi in Chloromonas. 



6. Achlyella Lagerheim {Hedw. 29: 143, 1890). 



Erected on the single species, A. flahaultii Lag., found in 

 pollen grains of Typha in water. 



7. Phlyctochytrium Schroter (1892: 78). 



A relatively large genus containing over a dozen species 

 occurring chiefly as parasites in algae. Except in the possession 



A\ d 



Fig. 25. — Rhizidium mycophUum A. Braun in slime of Chaetophora. (a) 

 Branching thallus bearing a sporangium, {h) Sporangia freeing swarmspores. 

 (c) Smooth-walled resting sporangium functioning as a prosporangium. {d) 

 Hairy resting sporangium, (e) Same functioning as a prosporangium. {After 

 Nowakowski 1877.) 



of a subsporangial vesicle the genus corresponds to Rhizophidium. 

 Resting spores are unknown. Two species, P. planicorne Atk. 

 and P. equale Atk., have been found in North America (Atkinson 

 1909 a) on Spirogyra. 



8. Asterophlyctis Petersen (Jour, de Botanique, 17: 218, 1903). 

 Erected on a single species, A. sarcoptoides Petersen, sapro- 

 phytic in empty nymph cases lying in water. 



9. Rhizochlosmatium Petersen {Jour, de Botanique, 17 : 216, 1903). 

 Erected on a single species, R. globosum Petersen, saprophytic 



in empty nymph cases lying in water. 



