b8 
Journal of Mycology 
[Vol. 10 
168. Plasmopara sordida Berk. 
On Scrophularia marylandica L. 
Sandusky, Erie Co., Ohio. Aug. 3, 1903. 
Coll. W. A. Kellerman. 
“Peronospora sordida n.sp. Maculis latis hypophyllis irregularibus 
sordide pallidis; floccis supra vage dichotomis, apicibus furcatis inaequali- 
bus; sporis obovatis apice apiculatis. 
“Forming broad, irregular, dirty, pallid spots on the und'er side of the 
leaves; threads loosely dichotomous above; tips forked, unequal; spores 
obovate, apiculate, .001 inch long.” Berkeley and Broome. Annals and 
Magazine of Natural History, III. 7 :449. 1861. 
169. Plasmopara viticola (B. & C.) Berl. & DeT. 
On (a) Vitis sp. cult., on leaves only; (b) Vitis vulpina 
L., on fruit only. 
Columbus, O. (a), Sandusky, O. (b). June 10, 1900. 
Coll. W. A. Kellerman. 
“P. [eronospora] viticola (Berk, et Curt.) Botrytis viticola Berk, et 
Curt, apud Caspary, Monastber. Berl. Acad.; Berkeley, Crypt. Bot., p. 301. 
Mycelii tubi crassi, saepe constricti varicosique (haustoria non vidi). 
Stipites conidiferi fasciculatim e stomatibus emergentes, graciles, elati, 
summo apice parum attenuato brevissime semel bisve dichotomi v. trifur- 
cati; sub apice ramos plerumque 4-6 (raro 3 v. 7) gerentes. Rami primarii 
plerumque alterno, distantes et exacte distichi, omnes pro stipitis altitudine 
breves; inferiores plerumque trifurcati divisionibus iterum bis trifurcatis 
v. quandoque bis dichotomis; ramuli ultimi (quarti) ordinis, aeque ac 
stipitis divisiones apicales, brevissime conico-subulati recti, acuti. Rami 
primarii superiores minores, inferiorum secundariis v. tertiariis conformes. 
Rami omnium ordinum angulis rectis patentes, primarii in uno piano 
divaricati, planum ramificationum secundi ordinis in primario, tertiariorum 
in primario et secundario perpendiculare. (Rarius rami primarii 2 in¬ 
feriores oppositi sunt, raro ramulis 2 ulterius muniti nec trifurcati, raris- 
sime rami primarii irregulariter sparsi nec distichi sunt.) Conidia parvula, 
ovoidea, apice lato rotundata v. subtruncata, pavilla destituta, membrana 
circumcirca aequali hyalina. 
Oogonia parva, membrana tenui hyalina v. lutescente oosporam foven- 
tia subglobosam episporio tenui fuscescente diaphano laevi munitam. 
Habitat in America boreali, in Vitis aestivalis Mich., et V. Labruscae 
L. folus, ibique (teste cl. Russell in schedula) mensibus Augusto et Sep- 
tembri abundat. Specimena a cl. Curtis in Carolina australi et a cl. J. L. 
Russel in civitate Massachusetts lecta cl. Caspary benevole mecum com- 
municavit. 
Stipites conidiferi in foliorum pagina inferiore caespites sistunt can- 
didos densos, maculas ibi praebentes numerosas saepe confluentes. Merito 
sane a cl. Berkeley (1. c.) haec species distinctissimis et nobilissimis 
adscribitur, neque tamen caeteris “perfectior” dici potest.” A. De Bary. 
Ann. Sci. Nat. IV. 20:125-126. 1863. 
