236 MICEOSCOPIC FUNGI. 



Peronospora Hyosoyami, De By. Henbane Mould; 

 fertile threads thick, 5-8 times dichotomons, branches patent, 

 attenuated, straight or slightly curved, the ultimate forming a 

 very obtuse angle, divergent, short, subulate, straight, acute ; 

 conidia small, ellipsoid, very obtuse ; epispore pale violaceous. — 

 On common Henbane. Market Deeping. 



Peronosjpora eiitospora,B. and Br. Flbabane Mould ; 

 fertile threads simple, clavate, surmounted by a crown of apiculi 

 bearing the ellipsoidal conidia, each of which is papillate at the 

 apex, endochrome granular; oogonia yellowish, subglobose, 

 tuberculate. — On Erigeron Cemadense. 



Peronospora Trifollorum, De By. Clover Mould; 

 fertile threads csespitose, equally or unequally 6-7 times dicho- 

 tomous, rarely trichotomous ; ultimate branches subulate, acute, 

 slightly curved; acrospores ellipsoid, very obtuse; membrane 

 with a slightly violaceous tint ; oospores large ; epispore brown. — 

 On Lucern {Medieago sativa). Highgate and Hampstead, 1864. 



Peronospora grisea, Ung. Veronica Mould; ferlile 

 threads erect, fasciculate, grey, 5-7 times regularly dichotu- 

 mous ; branches gradually attenuated ; primary oblique, erect, 

 others spreading, flexuose; ultimate mostly unequal, slightly 

 arcuate; acrospores ellipsoid or ovoid, obtuse; membrane pale 

 and dirty violet. — On leaves of Veronica beccabunga. May, 1846. 

 (Plate X. fig. 213.) 



Peronospora calotheca, De. Baiy. Mocci slender, 7-9 

 times dichotomous; primary branches oblique, erect, the rest 

 patent, squarrose, slender; ultimate ramuli short, straight, or 

 curved; acrospores elliptical; oospores globose; epispore baj- 

 brown, minutely reticulated. — On Galium Jparine. 



Peronospora arborescens, Berk. Poppy Mould ; fer- 

 tile threads slender, erect, 7-10 times dichotomous above; 

 branches more or less flexuose, squarrose, spreading, gradually 

 attenuated ; ultimate ramuli shortly subulate, more or less arcuate ; 

 acrospores very small, subglobose ; membrane scarcely violaceous. 

 — On the Corn Poppy. June. Common. 



Peronospora Sehleldeniana, De By. (P. destructor, B.) 

 Onion Mould ; fertile threads robust, erect, not septate, 

 branched alternately ; ultimate ramuli forked and uncinate or 

 divaricate ; acrospores seated on the tips of the ultimate ramuli, 

 obovoid or nearly pear-shaped, attenuated at the base; mem- 

 brane of a dirty violet-colour. — On the leaves of various species 

 of Allium. Often plentiful. (Plate XIII. fig. 263.) 



