CHYTRIDIALES 223 



slightly thickened wall, large central colorless oil globule, and an un- 

 branched endobiotic haustorium, possibly sexually formed, the adnate 

 contributing thallus 3 [x in diameter, germination not observed. 



On moribund vegetative cells of Zygnema sp., United States. 



This species differs from all the rest in the genus in the basal thicken- 

 ing of the otherwise delicate sporangium wall. 



RECENTLY DESCRIBED TAXA l 



Phlyctidium globosum Skuja 



Nova Acta Reg. Soc. Sci. Upsaliensis, Ser. IV, 16 (3): 367, pi. 63, figs. 1-5. 



1956 



Sporangium sessile, erect, globose to broadly ovate, with an acu- 

 minate papillate apex, 10-13 [x in diameter or 10-14 jjl wide by 12-15 u, 

 long, wall moderately thin, smooth, colorless; endobiotic part an ir- 

 regularly lobate, transversely elongate saclike haustorium; zoospores 

 thirty-two or more, globose or broadly ovate, 1.5-2 ja in diameter, 

 with a basal colorless globule and long fiagellum, escaping upon the 

 deliquescence of the apical papilla; resting spores not observed. 



In resting spores of the phytoplankter Aphanizomenon flos-aquae 

 (1 per cent of filaments infected), Sweden. 



Whether or not this can be considered a species of Phlyctidium is 

 questionable. A new species name will have to be given it, if kept in 

 this genus, since the same binomial, P. globosum (Braun) Sorokin, 

 has been applied to Rhizophydium globosum. 



Phlyctidium keratinophilum Ookubo and Kobayasi 



Nagaoa, 5: 1, fig. 1. 1955 



"Sporangia at first imbedded in the cortex of hairs, at maturity 

 emerging their upper half from the bursting place, globose, ellipsoid 

 or pyriform, papillately or conically elongated at the base, smooth, 

 thin-walled, colorless, apically or laterally with one papilla (5-10 [x 

 high), containing 20-30 zoospores; haustorium not observed. Zoo- 

 spores ellipsoid or pyriform, 3-4 x 3.5-5 jx, containing several oil 

 drops at their anterior part and with one refracting body at posterior 



1 Not included in the key. 



