322 FUXGUS-FLORA. 



Ovularia interstitialis. Mass. 



Spots hypophyllous, yellowish ; conidiopliores erect, 

 aseptate, simple subflexuous or irregularly nodulose, 

 60-80 X 5-6 fx,, supporting a single conidiutn attached 

 obliquely to the abrupt apex; conidia elliptic-oblong, colour- 

 less, 16-18 X 5-7 fjL. 



Peronospora interstitialis, B. & Br., Ann. Nat. Hist., sei". iv. 

 vol. XY. p. 34 (n. 1465); Sacc, Syll., vii. n. 867. 



On the under surface of primrose leaves. " Spots hypo- 

 phyllous, yellow, confined to the interstices of the veins, 

 rarely extending slightly beyond them." (Berk.) 



A singular species, a typical Ovularia. The above descrip- 

 tion is drawn up from the type specimens in Berkeley's 

 herbarium at Kew. 



Ovularia rufibasis. Mass. 



Hypophyllous, spots on under surface, pale on upper 

 surface bright brown, conidiophores erect, simple, aseptate, 

 60-80 X 4-6 fj,, apex abrupt with a very minute oblique 

 apiculus supporting a single conidium; conidia variable 

 in shape, obovate, ovate, or elliptic-oblong, colourless, 

 25-30 X 5-7 /A. 



Peronospora rufibasis, B. & Br., Ann. Nat. Hist., ser. iv. 

 vol. XV. p. 34 (n. 1456) ; Sacc, Syll., vii. n. 873. 



On under surface of leaves of Myrica gale. Eare. 



Spots small, pallid, with corresponding bright brown spot-! 

 on the upper surface of the leaf. The above diagnosis is 

 drawn up from Berkeley's type specimens. Evidently a 

 characteristic species of Ovularia. 



Ovularia cochleariae. Mass. 



Forming one or two large subcircular pale spots on leaves ; 

 conidia elongated, cylindrical, both ends round, colourless, 

 25-30 X 2-5-3/i;. 



Bamularia cochleariae, Cke., Grev., xi. p. 155; Sacc, Syll., 

 iv. n. 977. 



On living leaves of Cochlearia officinalis. 



Ovularia alnicola. Mass. 

 Spots circular, greyish -white then smoky, epiphyllous ; 

 Lyphae very short; conidia elliptical, colourless, in short 

 chains, 10-14 X 4 /it. 



