750 AQUATIC PHYCOMYCETES 



CANTERIOMYCES gen. nov. * 

 (Fig. 55 N-O, p. 752) 



Thallus endobiotic, holocarpic, lying loosely in the host cell or com- 

 pletely filling it, at maturity converted into a sporangium; zoospores 

 anteriorly uniflagellate, formed at the orifice of the discharge tube; rest- 

 ing spores not observed. 



Parasitic in the fresh-water algae Stigeoclonium and Draparnaldia. 



The method of zoospore formation, that is, outside the sporangium, 

 is sufficient grounds for separating de Wildeman's and Canter's fungus 

 from the marine ones with endogenously formed zoospores. Although 

 the protoplasm is typically discharged as a single mass from the spo- 

 rangium, it may emerge as several. 



The genus is named in honor of Dr. Hilda Canter (Mrs. J. W. G. 

 Lund). 



Canteriomyces stigeoclonii (de Wild.), comb. nov. 



Olpidium stigeoclonii de Wildeman, Mem. Herb. Bossier, 1900 (15): 3; 



Bull. Acad. Roy. Belg. (Sci.), V, 17: 297, pis. 1-2. 1931. 

 Anisolpidium stigeoclonii (de Wildeman) Canter, Trans. Brit. Mycol. Soc., 



33: 343, pi. 24-26, text figs. 1-6. 1950. 



"Thalli 1-4 partly or completely filling hypertrophied host cell; hya- 

 line smooth spherical 13-23 u, in diameter or oval, 9 x 21-21 x 46 \l 

 with one exit tube (very rarely two) elongate, 3-70 u. long; 3-8 \i broad, 

 wall thinner at apex. Content of thallus emerging as one or several 

 undifferentiated naked protoplasmic masses which undergo cleavage 

 into zoospores. Motile zoospores obpyriform 5 u, long x 2.5 fi. wide at 

 the apex, broad anterior end with single anterior flagellum 7.5 u, long; 

 content granular with a bright lateral granule" (Canter, he. cit.). 



1 Canteriomyces, gen. nov. Thallus endobioticus, holocarpicus, maturitate 

 in sporangium transformatus. Zoosporae antice uniflagellatae, in orificio tubi effer- 

 entis orientes ex massa (plerumque una sed interdum 2 vel 3) protoplasmatis nondum 

 differentiata. Sporae perdurantes nondum observatae. 



Parasiticus in generibus aquae dulcis Chlorophycearum Stigeoclonio et Drapar- 

 naldia. 



Originatione zoosporarum extrasporangiali valde differt a fungis similibus aquae 

 salsae sed zoosporis intrasporangialibus praeditis. 



Nomino id genus honoris causa pro Dr. Hildam Canter. 



