Uncixula ■ " 87 



his Host Index, '' Uncinia Columbiana'' diS the host plant of 

 Selby's species. . . ' ,. 



t . LL salicis has been hitherto recorded from Asia only from Si- 

 beria (Minussinsk). It appears, however, to be not uncommon in 

 Japan, whence Professor Miyabe has sent me specimens on five 

 species of Salix and on three species of Populus ; fi^om China 

 (Yunnan) it has been recorded, as mentioned above, under the 

 name oi Erysiphe popidi, \ The present species occurs also in India,- 

 but has been recorded as ErysipJie Jllartii by Cooke, in Grevillea 

 (83).' The specimen, collected at Simla on Populus ciliata^ is in 

 the Kew Herbariurn ; it is somewhat immctture, but shows some 

 fully ripe and characteristic perithecia. ' » * ■ 



Oestergren {j^JZ) has recently described a fungus fromUpsala,- 

 under the name of Uiicimda salicis (DC) Wint. var. epilobii n. v., 

 on which the following interesting observations (here given in 

 translation) are made : .... 



'* The ho?t-plants which arc given in the literature for Un- 

 cinula salicis belong to the genera SaliXy Popuhts and Bctnla ; it 

 was, therefore, quite surprising to find the above form, which very 

 closely agrees with U, salicis, on a host so widely different from 

 these genera as Epilobiuui augustifoUu)n, U. salicis appears, how- 

 ever, to have been once before recorded on a herbaceous plant, as 

 Winter (Die Pilze Deutschl. etc., 2 : 40) remarks that this species- 

 '*soll audi z.\i( Ai'tcjnisia vulgaris gefunden worden sein, doch 

 erscheint diese Aneabe sehr unwahrscheinlich." As mentioned 

 above, the form found on Epilobiuui agrees in its chief characters 

 with U. salicis. It appears worthy of note that the appendages 

 which are here so numerous at the base of the perithecium are 

 only of the same length as the perithecium, while in the type on 

 the contraiy they attain to quite double this length, and it is 

 worthy of remark, also, that at the time of maturity of the funguS 

 the mycelium appears to have almost completely disappeared, 

 while in the type, on the other hand, it is generally persistent. I 

 have, however, found the same behavior with regard to the my- 

 celium in several examples of U. salicis in the botanical collections 

 of the Upsala Museum. As the biological adaptation of the Ety- 

 sipheae to different host-plants is almost unknown, it may be best 

 to denote the morphological agreement of this form with U. sahcis 



