— 437 - 



cytium, — and such a species it is without doubt which I have seen a 

 single time in a Micrasterias — appears in the greater Desmidiacege. 

 I have separated these irregular forms from Myz. proHferum and referred 

 them to Myz. irregulare. 



Both forms are very common. 



38. Olpidiopsis Saprolegnice (Gornu) Fischer and 42. Pseudol- 

 pidium Saprolegnice (A. Braun) Fischer. 



Zoosporangia of parasites in the hyphse of Saprolegnia are very com- 

 mon, but the formation of resting spores is rare. 1 have seen the above 

 named species 3 times and Pseudolpidium Saprolegniae once in a hypha 

 of Achlya (cf. Fig. XVIII, d). The occurrence in Achlya does not in my 

 opinion imply the creation of a new species. 



39. Olpidiopsis Aphanomycis Gornu. 



The Aphanomyces on the Phryganeae-tegumenta are highly attacked 

 by a parasite (cf. Fig. XVII left). Once I found a resting spore indicating 

 the genus Olpidiopsis (Gornu) Fischer. (Fig. XVII right). 



40. Olpidiopsis echinata sp. nov.; cf. diagnosis page 405. 



To the Euchytridineae (with zoospores with one flagellum) I refer 6 

 families: Gladochytriaceae , Ghytridiaceae , Rhizophlyctacese , Rhizidiacete, 

 Eurychasmaceae with marine species, and Olpidiacese. Of these the Gla- 

 dochylriaceas and Chytridiaceas take up the highest place on account of 

 the presence of a mycelium. The lowest stage in this series is occupied 

 by the Olpidiacese, which I consider as endophytic Entophlyctis or Rhizi- 

 dium forms having lost the rhizoids. To the Rhizophlyctaceae I refer 

 forms with rhizoids taking rise from many points of the zoosporangium, 

 while the Rhizidiaceae comprehend forms with rhizoids rising from a 

 single point or a limited area (Rhizoclosmatium). 1 have subdivided the 

 Rhizidiaceae into 6 Subfamilies. 



51. Entophlyctis Vaucherice (Fisch) A. Fischer. 



I think I have observed rhizoids rising from various points of the 

 zoosporangium, as figured in Fig. XXII, c, f and e. According to that 

 this species is a right Entophlyctis, which genus is characterized by many 

 rhizoids rising from various points of the zoosporangium. 



52. Obelidium mucronatum Nowakowski. 



I have unfortunately not observed the zoospores. Nowakowski indi- 

 cates no flagella. 



