530 Gäu mann, Über die Formen der Perouospora parasitica, (Pers.) Fries. 
Caespitulis raris, in tergo foliorum expansis; conidiophoris 
singulis e stomatibus exeuntibus, 400 g altis, furcis 10—60 g longis, 
literae „sigma“ similiter curvatis; conidiis parvulis, fere globosis, 
9 — 24, fere 14 — 19 g longis, 9^-21, fere 13 — 19 g latis, longitu- 
dine media 16,30 g, latitudine media 14,50 g\ oogoniis et oosporis 
ignotis. Habitat Arabidopsidem Thaliauam (L) Heynhold [Steno- 
phragma Thalianum (L.) Cel.]. 
Perouospora Teesdaleae. 
Caespitulis raris, in tergo foliorum expansis; conidiophoris 
singulis e stomatibus exeuntibus, fere 300—400 g altis, furcis literae 
„sigma“ similiter curvatis, sed parte ultima rami longioris inflexis; 
conidiis late ellipsoideis, 11 — 17, fere 12 — 15 g longis, 9—14, 
fere 11 — 13 g latis, longitudine media 21,25 g, latitudine media 
18,62 g. Oogoniis et oosporis ignotis. Habitat Teesdaleam nudi - 
caulem (L) KBr. 
Perouospora Thlasp eos alpestris. 
Caespitulis raris, in tergo foliorum expansis; conidiophoris 
singulis e stomatibus exeuntibus, parvis, 120—250 g altis, 
ramis undulatis, furcis literae „sigma“ similiter curvatis (cf. fig. 40); 
conidiis ellipoideis, 13 — 27, fere 19 — 24 g longis, 12 — 23, fere 
16—19 g latis, longitudine media 20,81^, latitudine media 18,13 g\ 
oogoniis et oosporis ignotis. Habitat Thlaspi alpestre L. 
Perouospora Thlaspeos arveusis. 
Synonyme: 
Per . parasitica Pers. f. Tlhcispeos Schneider 1864 (nom. nud. in sched. Herb. 
Schles. Pilze 14). 
Per. parasitica de By. f. Thlaspeos arvensis de Thümen 1873 (nom. nnd. in 
sched. in de Thümen. fungi austriaci 936, et 1874 in de Thümen, Myco- 
theca universalis 48). 
Caespitulis raris, in caulibus, siliquis et in tergo foliorum 
expansis; conidiophoris singulis vel plurimis e stomatibus exeuntibus, 
250—400, fere 300 g altis, ramis undulatis, furcis literae „sigma“ 
similiter curvatis vel variabilibus; conidiis late ellipsoideis, muta- 
bilibus, 17—32, fere 24—29 g longis, 14—26, fere 18 — 22 g 
latis, longitudine media 25,45 g, latitudine media 20,13 g\ oogoniis 
e tunica persistenti formatis, 54—59 g diam., oosporis globosis, 
35—37 g diam. Habitat Thlaspi arveuse L. 
Perouospora Thlasp eos perfoliati. 
Synonyme: 
Per. parasitica de By. f. Thlaspeos perfoliati de Thümen 1872 (nom. nud. in 
sched., in de Thümen, fungi austriaci 407). 
Per. ochloreuca Ces. f. Thlaspi Fuckel ex parte (nom nud. in sched. Fungi 
rhenani 8). 
