562 PhycOmycete, PerOnospOr&cese, PeronOspor&. 



100 a. diam., tunica crassa hyalina, oosporam unicam globosam 

 50-80 [t. diam., episporio clegantor densequc areolato fulvo-fuli- 

 gineo subopaco tectam gerentibus. 



Hab. in foliis vivis Nicotian;i' longiflorae in ncmerosis 

 Palermo vocatis, prope Buenos Aires Argentinn? Amer. merid. 



4. Peronospora dubia Berl. Ic. fung. Phycom. p. 23, t. 28, Pero- 1769 

 nospora Hyoscyami Thiim. Fungi Austr. n. 939, non De Bary. — 

 CsBspitulis densiusculis, griseolis; conidiophoris humilibus, 180- 

 220 « 9-10, paucis e stomatibus fasciculatim exeuntibus, superne 



ter quatcr dichotomo-ramosis, ramis pnenultimis et ultimis rectan- 

 gulo-divaricatis, rectis v. parum curvis, ultimis vero apice obtu- 

 siusculis; conidiis majusculis late obovoideis, basi parum attenua- 

 tis, superne obtusissimis, 22-27*16-20, pallide griseolis ; oosporis 

 ignotis. 



Ilab in foliis Hyoscyami nigri in Austria. — A Per. 

 Hyoscyami videtur diversa et potius P. effusat v. minori proxima. 



5. Peronospora Floerkeae Kellerm. Journ. of Mycol. 1904, pag. 172, 1770 

 tab. 74. — Conidiophoris crasse cylindraceis. 16-18 ;i. cr., elon- 

 gatis, longo tractu simplicibus, supra copiose ramosis, ramis semel 



v. bis dichotomice v. irregulariter divisis, ramulis summis tenui- 

 bus, angustis, conspicue curvatis; conidiis ovoideis v. subglobosis, 

 24-32*18-25; oosporis numerosis, subglobosis, 24-36 ;j.. diam., 

 membrana brunneola, levi v. leviter rugosa. 



Hdb. in foliis caulibusque Floerkese proserpinacoidis, 

 Columbus, Ohio Amer. bor. — Affinis Per. parasiticie sed irre- 

 gularius ramosa, ramulis ultimis longioribus, vix matricem defor- 

 mans etc. 



6. Peronospora Saxifragae Bubak in Hedw. 1903, p. (103;. — Cye- 1771 

 spitulis laxis, tenuibus, dilute violaceis ; conidiophoris quater-sexies 

 dichotomo-ramosis, leviter bulbosis, 400-800 a. long., infra 11- 



14 ;j.. cr.; ramulis, angulo acuto patentibus, ultimis inrcqualibus 

 saepe 11-20 ;j.. long. angulo recto v. obtuso divergentibus, fortiter 

 incurvatis, saepius laxis; conidiis dilute violaceis, ellipsoideo-oblon- 

 gis, 26-33 * 17-22, apice rotundatis, basi in pedicellum brevem at- 

 tenuatis indeque soepe piriformibus; oosporis non visis. 



Ilab. in foliis Saxifragaj granulatae, prope Pragam Bohe- 

 miae. — A Per. Chrysosplenii probe distincta. 



7. Peronospora Polygoni Halst. Journ. of Myc. 1889, p. 9, Berl. Ic. 1772 

 fung. Phyc. p. 25, t. XXXI. — Cyespitulis densis sordide viola- 

 scentibus, effusis; conidiophoris plerumque pluribus c stomatibus 



