CHYTRIDIALES 157 



In Antithamnion plumulae, Cohn (loc. cit.), Germany; Calithamnion 



plumulae, Magnus (1875: 77), Denmark. 



Fischer {loc. cit.) gives Chytridium antithamnii Cohn and Cyphidium 

 plumulae Magnus as synonyms. 



According to J. and G. Feldmann (1955: 232) this species is based 

 on normal structures of the alga, that is, the secretory cells. 



* Olpidium ramosum Serbinow 



Leningradskoe obshchestvo estestvoispytatelei Trudy (Trav. Societe des 

 Naturalistes de Leningrade), 30: 255. 1899 



Evidently based on a mixture of an olpidioid chytrid and a form 

 with a type of sexual reproduction like that of Olpkliopsis or Lage- 

 nidium enecans. 



In pollen of Pinus syhestris, Russia. 



PRINGSHEIMIELLA Couch 



J. Elisha Mitchell Sci. Soc, 55: 409. 1939 



"Obligate endophytic parasites on Saprolegniaceae. Thalli from zo- 

 ospores multiplying in host hyphae. Zoosporangial sori formed in 

 the ends of host hyphae and resembling in superficial appearance and 

 development the host zoosporangia. Sporangia globose or polygonal 

 from pressure, each sporangium with an emergence papilla. Zoospores 

 posteriorly uniflagellate, very minute. Resting bodies unicellular, spher- 

 ical, brownish when mature, one to several formed within a larger 

 polygonal or irregularly shaped cell. Zoosporangial and resting spore 

 membranes bluish purple with chlor-iodide of zinc" (Couch, loc. 

 cit.). 



In hyphae of aquatic Phycomycetes. 



Erected to accommodate a true chytrid. first seen by Pringsheim 

 (1860), which has a superficial resemblance in the zoosporangial stage 

 to Woronina polycystis. 



PRINGSHEIMIELLA DIOICA Couch 



J. Elisha Mitchell Sci. Soc, 55: 410, pi. 49. 1939 

 "Infection by zoospores which leave cyst on host wall. Thalli from 



