458 rhycomycetaB, Peronosporacese, Peronospnra. 



CYSrOPUS Lev. — Sacc. Syll, VII, p. 233, IX, p. 340, XI, p. 242. 



1. Cystopiis SolivSB (Schroet.) Sacc. et Syd. Allnigo Solivcu Schroet. 1736 

 Hedw. 1896, p. 210. — Soris ampliigeiiis sparsis vel aggregatis 

 albis vel subflavescentibus pustulatis 0,5-3 mm. diametro, cuticula 

 vesiculosa tectis; conidiis subglobosis, 20-22 v 18-20; episporio hya- 

 lino, medio annulato-incrassato; oosporis subglobosis, atro-castaneis, 

 60-66 fji., episporio minute reticulato. 



flab. in foliis Solivae anthemidifoliaB in prov. St. Catha- 

 rina Brasiliae {Ule). 



PERONOSPORA Corda. — Syll. YII, p. 244, IX, p. 342, XI, p. 243. 



1. Peronospora Ficariae Tul.-Sacc. Syll. VII, p. 251. — *P. glacialis 1737 

 Blytt, Christiania Vid. Selsk. Forh. 1896, n. 6, p. 20. — Hyphis 

 conidiophoris epiphyllis (h. e. in pagina foliorum superiore); co- 

 nidiis niveis; oogoniis et oosporis ut in P. Ficarice typica. a qua 

 tantum notis supra indicatis differt. 



Kab. in foliis E-anunculi glacialis, Dovre, Norvegia. 



2. Peronospora megasperma Berl. Icon. fung. Phycom. pag. 21. 1738 

 t. XXIV, P. Violce E. et Ev. N. A. P. n. 2207, nec De By. — 

 Caespitulis effosis, albeseentibus ; oonidiophoris erectis, 300-400 v 

 9-10, ter-5-ies ramosis, ramis ultimis elongatis, cylindraceis, apice 

 truiicatis; conidiis magnis, obovoideis, superne late papillatis, 80- 

 95^40-45, hyalinis; oogoniis globulosis v. saepius pressione po- 

 lyhedricis, magnis 48-54 fx. d. tunica crassa amoene lutea v. fusco- 

 lutea; oosporis globosis 36-40 fj . diam. pallide lutescentibus, pe- 

 rinio a periplgismate sat concreto lutescenti-fuscidulo v. brunneo- 

 fulvescente formato diu adhaerente, tectis. 



Hah. in foliis V i o 1 as t r i c o I o r i s var. arvensis in Amer. 

 bor. 



3. Peronospora leptosperma I)e By.-Sacc. Syll. VII, p. 254. — Var. 1739 

 Siegesbecki» Lagh. Bull. Boiss. 1895, p. 61. — Strato albo, laxo; 

 conidiophoris arborum modo divisis, 2<X)-300 u. altis, 10 p.. crassi?, 

 corona ramis plerumque tribus, cylindricis, rectis, erecto-patentibus, 

 ramulis ultimis 6-12 u. longis, rectis, subulatis, angulo recto pa- 

 tentibus; conidiis ovali-globosis, 27-30 a, diam., membrana achroa; 

 oosporis ignotis. 



Hab. in foliis vivi.^ Siegesbeckiae in ^quatoria. 



4. Peronospora AlchemillaB Oith, B^-rn, Mittheil. 1868, p. 65. — 1740 

 Hyphis quinquies dichotomis, ramulis ultimis subulatis, saepiuH 

 inajqualibus, altero nempe longiore et subporrecto, altero laterali 



