MiCROSPHAERA 125 



what recalling those of M, grossidariae. In M. bcrbcridis, how- 

 ever, the branches of the first and second orders are of about equal 

 length to the others, so that the manner of branching of the whole 

 apex differs conspicuously from that of M, grossulariae, where the 

 primary and secondary branches are extremely short {cf. Figs. 

 34, 35, and 40. 41). M, grossidariac has, also, shorter appendages 

 and slightly larger spores. 



M, alni, var. lonicerae differs from M. bcrbcridis in the spread- 

 ing ultimate branches of the apex of the appendages, which occa- 

 sionally have recurved tips, the usually fewer asci, etc. 



At the beginning of last November my attention was directed 

 to some bushes of Bcrbcris [Mahond) aqnifoliinn in a shrubbeiy 

 near Reigate, Surrey, England, which were, chiefly on the young 

 shoots, more or less white with the mycelium of J/! bcrbcridis. 

 The perithecia were densely gregarious on both sides of the leaf, 

 and agreed in all characters with examples of the species on the 

 usual host, B, vulgaris. This occurrence on an evergreen species 

 of Bcrbcris is very interesting, as hitherto in its wide range in Eu- 

 rope, and in Asia, the species has been supposed to be absolutely 

 confined to a single species or host -plant, viz. Bcrbcris vulgaris. 



The Japanese example of the present species was sent to me 

 by Prof. Miyabe, and agrees perfectly with the European plant, 

 and the same is the case with beautiful specimens sent by Prof 



Gennardius from Cyprus. 



2. M. EUONVMi (DC.) Sacc. 



Erysiphe cuonymi DC. Fl. Fr. 6: 105. 181 5; Duby, Bot 

 Gall, 2 : 871. 1S30. 



Alphitomorpha comata Wallr. BerL Ges. Nat. Freund. \^erh. I 

 40. 1819; Wallr. Fl. Crypt. Germ. 2: 757, 1833. 



Wall 



1819. 



Erysibc comata (Wallr.) Ficin. Schub. Fl. Gegend. Dresd. 2 : 

 1823; Lk. in Willd. Sp. PI 6: 114. 1824; Rabenh. 

 atschl. Krypt. FL I : 231. 1844. 

 Erysiphe penicillata, van euonymi Fr. Syst. Myc. 3: 244. 



1829. 



Myc 



1833- 



MicrospJi 



