Se 
=.B — ? 
Peronosporei. Myceli endophyti tubi liberi ramosissimi, 
seplis plerumque destituti, achroi, parenchymatis hospitalis 
meatus intercellulares oceupantes et haustoria siepe in cellularum 
ipsarum penetralia intrudentes. 
Organa reproductiva duplicis generis: 
1° Gonidia$ cellule simplices, sexu carentes, in ramis 
mycelii propriis (ramis v. stipitibus conidiophoris) plerumque 
septis omnino carentibus (forte Lantum septalis), e plante nu- 
trieis epidermide emergentibus aut erumpenlibus terminales, 
maluritate deciduse; aut sporarum vicem gerentes, id est ger- 
minando tubum simplicem, mycelii novi primordium, protru- 
dentes, aut zoosporas gignentes. 
2° Organa sexualia: Oogonia in mycelii ramis orla, sem-. 
perque in plants hospitse parenchymate inclusa, terminalia v. 
interstitiala, subglobosa, fecundatione peracta oosporas solitarias 
generantia. Antheridia cellulas simplices sistentia, in ramulis 
mycelii terminales v. interstitiales, irregulariter oblongas, obo- 
vatas, clavatas, solitarias, oogomis arcte adpressas tubumque 
angustum oogonii membranam perforantem oospor® primordium 
fecundantem emittentes. Antherozoidia nulla. Oospore ma- 
tur protoplasma granulosum . conlinentes, endosporio erasso 
hyalino, episporio valido plus minus fucato spe angulato 
eristato reticulato verrucoso tuberculato, rarius levı, munite, 
germinando sporas numerosas agiles (an semper?) gignentes. 
‚Familia valde naturalis, hinc arclissime Saprolegnieis 
Pringsh. illinc fungis cw@teris aerobiis affınis. 
1. Peronospora Corda (Icon. Fung., I. p. 20). Botry- 
tidis spec. auctorum plurim. Mucoris spec. Sowerby. Bremia 
Regel, Bot. Zeit. 1843. Actinoboirys H. Hoffm., ibid., 1856, 
154. Monosporium Bonorden, Allg. Mycol., p. 9. 
enuatis gerentes.. Er 
‚ eylindriei, ramosi, et comidia solitaria in ramorum apicibus 
Ei $ % A .ı* : . . Tr 
-. Seetio 1. Zoosporipare. Gonidia vandida, apice pa- 
 ortas e papilla emittentia, j Brit 
4. P. infestans (Mont.) Mycelii tubi graciles, haustoriis 
 semper fere destituti. Stipitis conidiophori tenues, sursum sensim 
attenuati, sub apice conidifero semel v. pluries vesiculoso-inflati, 
superne ramos 1—5 sparsos stlipilis primarii apici conformes 
patentesque gerentes. Rami aut simplices aut rarius ramulo 
brevi muniti (slipes primarius rarissime omnino simplex 
. + 
Kt 
