Salmon : The Erysiphaceae of Japan 439 



ischen Art schon ausserlich durch das dickfilzige, weisse bis 

 gelbliche Mycel gut verschieden. ,, In the specimen sent (on Morns 

 alba, Tokio, leg. Miyoshi), the mycelium is persistent in a thin 

 effused coat, but, as I have already shown (3), it isimpossible to re- 

 gard the persistence or evanescence of the mycelium in the Ery- 

 siphaceae as a systematic character of the first importance. In 

 certain examples of P. corylca (P. suffulta) on Corylus from 

 Europe, and on Qncrcns from North America, the mycelium is 

 frequently persistent just as in the Japanese plant, but no characters 

 are shown of sufficient weight to separate the plants in any way from 

 the type. It is interesting to find that in a specimen of P. corylca, 

 sent to me by Professor Miyabe, on the same host {Moms alba) 

 fromSapporo (E. Tokubuchi) the mycelium is perfectly evanescent. 

 Microspliacra sambncicola P. Henn. (" on Samlntais, Japan ") is 

 M. grossulariae . This is the form of the species which was de- 

 scribed by Gerard, from American specimens on Sambucus Cana- 

 densis, as M. Van Bmntiana, but which has been correctly referred 

 to M. grossitlariae by Burrill (Ell. & Everh. N. Amer. Pyren., 

 p. 24). 



Microsphaera Japonica P. Henn. (on Cornns macrophylla, 

 Tokio). The author remarks (2) " Die Art ist von M. pnlchra C. 

 et Peck durch 8-sporige, eiformige Asken durch die spitzen En- 

 den der Anhangsel u. s. w. verschieden, derselben aber nahe ste- 

 hend." I have already (3) referred this Japanese plant to M. alni, 



* 



and also shown that " M. pnlchra " — which is a more extreme 

 form than the present plant cannot possibly be maintained as 

 distinct. From the description given in the diagnosis (2) it would 

 appear that the appendages were observed in an immature con- 

 dition. The apex of a mature appendage is shown at Fig. 24. 

 Comparison of this figure with those I have given (3) of the ap- 

 pendages of M. alni will show the identity of the Japanese plant. 

 Uncimtla Shiraiana P. Henn. (on Ccltis Sinensis, Tokio) is U. 

 polychacta. I had already seen examples of this fungus on the 

 same host from Tokio, Sugamo (S. Hori). In these latter specimens 

 the asci are 2-, or more often 3-spored, in Dr. Hennings' plant 

 the asci are usually 3-spored, sometimes 2- or 4-, or very rarely 

 5-spored. In examples of the species from America the spores 

 are almost constantly 2 in number, and the peculiarity of the 



