596 MUCEDINES. 



acute, slightly curved ; acrospores ellipsoid, very obtuse ; mem- 

 brane with a slightly violaceous tint ; oospores large ; epispore 

 brown. — Cooke Micr. F.p. 216. De Bary Ann. Sc. Nat. (1863), 

 XX. ^9. 1 J 7. Rahh.exs.no. lib, F.E. no. 375. Fckl. exs. no.d. 

 Cooke exs. no. 194. 



1784. Feronospora grisea. Ung. "Veronica Peronospora." 



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

 dichotomous ; branches gradually attenuated ; primary oblicjue 

 erect, others spreading, flexuose, ultimate mostly unequal, 

 slightly arcuate ; acrospores ellipsoid or ovoid, obtuse ; mem- 

 brane 23ale and dirty violet. — Ung. Bot. Zeit. 1847. Cooke Micr. 

 F. 1. 10,/. 213. Fckl. exs. no. 10. De Bary Ann. Sc. Nat. (1863), 

 XX. t. 13, f. 12. Botrytis grisea, B. 4' Br. Ann. H.N. no. 528. 



On leaves of Veronica heccahunga. May. 



1785. Pexonospoza axboxescens. Berk. ** Poppy Peronospora." 



Fertile 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 — .Cooke Micr. F.p. 217. De Bary Ann. Sc. Nat. 

 (^1863), XX. j9. 119. Botrytis arhorescens, Berk. Jour. Hort. Soc. 

 i.^. 31, t. 4, /. 24. B. ^ Br. Ann. N.H. no. 525. Rahh. exs. no. 

 323. Fckl. exs. no. 4 ^' 13. 



On Papaver rhceas. Common. 



1786. Peronospora Candida. jF'ckl. " Primrose Peronospora." 



Densely csespitose, white ; fertile threads slender 6-10 times 

 dichotomously branched ; ultimate branchlets short, spreading ; 

 acrospores ellipsoid or ovoid, obtuse, minute ; oospores bright 

 brown. — Fckl. exs. no. 38. De Bary. Ann. Sc. Nat. (186^), xx. 

 p. 120. Cooke Micr. Fung. 2nd ed. p. 225. 



On primrose leaves. Corwen, N. Wales. 



Fonning dense white patches on the under surface of the leaves. 



1787. Peronospora Schleideniana. De By. "Onion 



Peronospora." 



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 ; membrane of a dirty- 



