Classification , [27 



tomentose patches on the under surface of the 

 leaves. 



Peronospora sordida, Berk. 



Forming broadly effused diogy patches; gonidio- 

 phores tall, lower unb ranched portion elongated, 

 equal, dividing irregularly into 3 — 6 main branches, 

 which are 2 — 4 times irregularly forked, often more 

 or less curved downwards, bifurcate at the tips, 

 ultimate branchlets short, conico-subulate, often 

 curved and deflexed ; gonidia broadly elliptical, obtuse, 

 with a very faint tinge of lilac, or colourless, 20-28 

 X 15-20 /^. 



Peronospora sordida, Berk. Ann. Nat. Hist. ser. iii. 

 vol. vii. p. 449, n. 953; Cke. Hdbk. n. 1789; Cke. 

 Micr. Fung. p. 217 ; Sacc. Syll. vii. n. 881. 



On under surface of leaves of tScrophularia aquatica, 

 S. nodosa, S. altaica, Verbascum hlattaria, F. thapsus, 

 V. thapsiforme, V. nigrum, V. virgatum, Digitalis 

 purpurea. Not uncommon. 



The gonidia are described as obovate and apiculate> 

 but I have not seen this in the type specimens or any 

 other examined, but always as described above. 



Peronospora sparsa. Berk. 



Gonidiophores scattered, simple for some distance 

 from the base, divided above into 3 — 5 main, 

 suberect branches, which are 2 — 4 tiines irregularly 

 forked, and sometimes slightly curved and deflexed, 

 ultimate branchlets generally curved, conico-acumi- 

 nate ; gonidia broadly elliptical, very obtuse, 17-20 

 X 14-16 At. 



