85 



Hab. Iii Paimicc Accfosa ct //. Acclosclla prope iMii- 

 stiala mensibus Junio et Julio rarius obvia. 



21. P. Potentillae De B. 1. c. 



Stipites zoosporangiifcri gracilcs, densc cacspitosi, 5- 

 6-ies dichotomi, rainis modice elongatis, flcxuosis, ultimis 

 longe subulatis arcuatis. Zoosporangia cllipsoidca, obtusis- 

 sima, membrana dilutissime violacea. 



Hab. In foliis Polcniillac aryentcae et Alchcmiliac vul- 

 garis, aestate. 



V. PHYTOPTHOEA De B. 



1. Ph. infestans (Mont.) De B. Research. nat. po- 

 tato-fung. in Journ. Agric. Soc, Ser. II, Vol. XII, part. I, 

 N:o 2.3, 1876 et in Journ. Bot. 1876, p. 105—126, 149—154. 



Hyphae niycelii graciles, haustoriis semper fere dcsti- 

 tutae. Stipites zoosporangiorum tenues, sursuni scnsim attc- 

 nuati, sub apice zoosporangiifero semel vel plurics vesiculo- 

 so-inflati, superue ramos 1—5 sparsos stipitis primarii apici 

 conformes patentesqve gerentes. Piami aut siinplices aut ra- 

 rius ramulo brevi muniti (stipes primarius rarissime simplcx 

 occurrit). Zoosporangia ellipsoidea vcl ovoidea, apice pa- 

 pilla prominente munita. Oosporae sphaeroidcae, parvae, 

 episporio laete fusco, verrucis crassis, hemisphacricis vel 

 conoideis obsitae. 



Syn. Botrytis infestans MoNT. Mcni. dc Tlust. 1845, p. 113. 

 Berk. et Br. in Aun. Nat. Hist. n:o 521. Peronospora infestans 

 De B. Eech. sur le dev. Pcr. iu Ann. Sc. uiit. 4 scr. XX. CooK. 

 Brit. Fung. 11, p. 593. WoRxn. Sm. Tlic rcst. spor. of. pot. dis in 

 The Gard. Chron. 1875, n:o 80. P. devastatriv Casp. 



Exsicc. Kaust. Fung. Fenn. 498. v. Tiiuii. Mycoth. univ. 

 423. Desm. Cr. Fr. 1492. 



Hab. Solanwn luijcrosum, raro S. dulcamaram. iiifestat 

 aestate et autumuo praesertim annis pluviosis. 



