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85
Hab. In Rumke Acelosa et R. Acclosclla prope
Mustiala mensibus Junio et Julio rarius obvia.
21. P. Potentillae De B. 1. c.
Stipites zoosporangiiferi graciles, donse caespitosi,
5-6-ies diebotomi, ramis modice elongatis, flcxuosis, ultimis
longe subulatis arcuatis. Zoosporangia ellipsoidea,
obtusis-sima, membrana dilutissime violacea.
Hab. In foliis Potentillae argenleae et Alchemillae
vulgaris, aestate.
V. PHYTOPTHORA 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 23, 1876 et in Journ. Bot. 1876, p. 105—126, 149—154.
Hyphae mycelii graciles, haustoriis semper fere
desti-tutae. Stipites zoosporangioruni tenues, sursum sensim
atte-nuati, sub apice zoosporangiifero semel vel pluries
vesiculo-so-inflati, superne ramos 1—5 sparsos stipitis primarii apici
conformes patentesqve gerentes. Rami aut simplices aut
rarius ramulo brevi muniti (stipes primarius rarissime simplex
occurrit). Zoosporangia ellipsoidea vel ovoidea, apice
papilla prominente munita. Oosporae sphaeroideae, parvae,
episporio laete fusco, verrucis crassis, hemisphaericis vel
conoideis obsitae.
Syn. Botrytis infestans Mont. Mem. de l’Iust. 1845, p. 113.
Berk, et Br. in Ann. Nat. Eist. n:o 521. Peronospora infestans
De B. Rech, sur le dév. Per. in Ami. Sc. nat. 4 ser. XX. Cook.
Brit. Fung. II, p. 593. Worth. Sm. The rest. spor. of. pot. dis in
The Gard. Chron. 1875, n:o 80. P. devastatrix Casp.
Exsicc. Karst. Fung. Fenn. 498. v. Thüm. Myco th. univ.
423. Desm. Cr. Fr. 1492.
Hab. Solanum tuberosum, raro S. (lulcamaram, infestat
aestate et autumno praesertim annis pluviosis.
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