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HANDBOOK OF 
On putrid substances. Queensland. (Fig. 249.) 
In the Queensland form Morelice, the spores a little larger and 
very pale brown. 
Family II. PERONOSPORACE7E. DBy. 
Hyphas often branched, couidia often producing zoospores, 
thereupon germinating. Reproduction agamic, either by zoospores 
or by conidia directly germinating, or sexual by oogonia and 
antheridia. 
Genus 5. CYSTOPUS. Lev. 
Conidia-bearing hyphse simple, even, cylindrical or clavate, very 
obtuse, congregated in pulvinate sori, bearing chains of conidia at 
the apices. Sori at first covered, then ruptured, dispersing the 
conidia, white or yellowish. Couidia hyaline, producing zoospores. 
Oospores globose, epispore usually reticulate or warted. 
1695 . Cystopus candidus. Lev. Ann. Sci. Nat. 1847 t. vm., 
p. 871. Sacc. Syll. 792. 
Sori erumpent, white, variable ; conidia uniform, globose, 10- 
18 p, enclosing membrane equal, colourless, oospores subglobose, 
35-40 p, epispore yellow-brown, studded with thick, irregular, 
obtuse, sometimes confluent, warts. 
On leaves, stems, etc., of Crucifer ce. Victoria. (Fig. 251.) 
Genus 6. SCEEROSFORA. Schr. 
Conidia-bearing hyplue erect, with a few branches ; conidia 
ovate, producing zoospores, which escape at the papillate apex. 
Oospores globose, with a very thick epispore of many strata, 
brown. 
1696 . Sclerospora macrospora. Sacc. Hedwigia 1890, 155. 
Conidia state unknown. Oogonia thickly parallel, seriate, 
covered by the epidermis, rngosely punctulate, becoming brownish. 
Oospores spheerial, large (60-65 p), epispore even, bistratose, 
hyaline-brownish, many nucleate within, arising from narrow, 
branched, hyaline hyphse. 
On leaves of Alopecurus. Caromby. 
Genus 7. PERONOSPORA. Corda. 
Mycelium bearing filiform, branched haustoria. Conidia- 
bearing hyphaj solitary, or fasciculate, cylindrical, many 
times branched. Terminal branchlets acute, curved or subulate, 
conidia ovate or elliptic, without apical papilla:, germinating 
laterally. 
1697 . Peronospora hyoscyami. DeBavy Champ. Par. 1863, 
p. 123. Sacc. Syll. 877. 
Conidia-bearing hyphse thick, tall, 5-7 or 8 times dichotomous ; 
branches spreading, attenuated, straight or slightly curved, the 
ultimate branchlets diverging at a very obtuse angle, short, coni- 
cally subulate, straight, acute ; conidia few, ellipsoid, quite obtuse, 
membrane slightly tinged violet, 13-24 x 13-18 p. 
On Tobacco leaves. Queensland. (Fig. 252.) 
