G9 



lino, episporio valido plus niinus fucato, reticulato vcl ra- 

 rius laevi praeditae. Hyphac mycclii mcnibrana pracditao, 

 entophytae, liberae, ramosissiinae, septis plcrumqve destitu- 

 tae, meatus parenchymatis hospitalis intercclluhircs occupan- 

 tes et haustoria saepe in penetralia ccUuUirum ipsarum in- 

 trudentes. 



IV. PERONOSPORA Coiin. Icon. Fung. I, p. 20. 

 Hyphae zoosporangiiphorae solitariae vcl fascicuhitac 



e stomatibus vel cellulis epidermidis perforatis phintac ho- 

 spitae egredientes, cylindraceae, ramosac, et zoosporangia 

 solitaria in apicibus ramorum attenuatis gerentes. 



V. PHYTOPTHORA De B. in Journ. Roy. Agric. Soc. 

 ser. II, voL XII, part. I, n:o 23, 1876. 



Zoosporangia per pluria, in apicibus ramorum succes- 

 sive generata. 



VI. GYSTOPUS Lev. 



Hyphae zoosporangiiphorae simplices, laeves, cylindra- 

 ceae vel clavatae, obtusissimae, in ramis mycelii fascicuhitae 

 atqve in soros pulvinatos copiosissime congregatac; singulae 

 apice zoosporaugiorum seriem moniliformem gerentes. Sori 

 epidermide plantae nutricis primo tccti, dcin cpidcrmidem 

 dirumpentes et zoosporangia matura dispergentes, candidi vel 

 lutescentes. Zoosporangia aut omnino conformia, hyalina, 

 zoosporas gignentia, aut difforraia, plurima hyalina zoospo- 

 ripara, pauca autera, in monili terminalia, membrana cras- 

 siore saepe lutescente praedita, aut germiuando tubum sinip- 

 licem protrudentia aut sterilia. 



Fam. III. CHYTRIDIACEAE. 



Mycelium nudum, membraua carens, mobile. Organa 

 reproductiva: celiuiae perdurantes cellulas matricales zoos- 



