204 A Monograph of the Erysiphaceae 



50 X 30 fi, bisporis. Sporidiis ellipticis, hyalinis, 18x9 /"• On 

 leaves of grape vine. Near Melbourne (Mueller). Allied to E. 

 lamprocarpa, but apparently distinct from all the disporous species. 

 We have seen the floccose mycelium before, but without peri- 

 thecia. Hitherto we have not been successful in detectingfor iden- 

 tifying the conidia. Destructive to the vines in Australia, but 

 there is no evidence on which to connect it with Oidmni Tuckcri^ 

 but on the contrary, the floccose mycelium is much more woolly, 

 and commonly sterile, at least in so far as we have seen specimens. 

 Leaves and twigs sent to us from Australia last year with a thick 

 cottony-white mycelium, but without fruit of any kind, was prob- 

 ably the same species. It has every appearance of beii 

 ous pest." On the sheet with the type-specimens at Kew, there 

 is a drawing (reproduced in Cooke's Handbook of Australian Fungi) 

 (89) or of an ascus with two spores, but on the type-specimens 

 themselves I can find no fungus. The host-plant is one of the 

 forms of Vitis vinifera in which the under surface of the leaves, 

 the young wood, etc., are covered with a more or less dense cob- 



s " '^'^''5 



webby tomentum, and it appears that this has been mistaken for 

 floccose mycelium, as of this- there is no trace. The description 

 given above of the mycelium—" commonly sterile," etc.— favors 

 this view. It is possible that the perithecia which were seen were 

 stra\' ones of E. cichoraceanun. 



The fungus described by de Thuemen (3 54) as Oldium tabaci, 

 on Nicotiana Tabaaun, from Portugal is apparently the conidial 

 form o{ E. dehor ace arum, as on specimens sent to me by Professor 

 Getmardius, from Argos, Greece (named 0. tabaci), there occur 

 numerous perithecia of this Erysiphe (see Passinini 272). 



3. E. GALEOPSiDis DC [Figs. 127-129] 



Mucor Erysiphe L. Sp. PI. 2 : 1 186 (partim). 1753. 



Erysiphe galeopsidis DC. Fl. Fr. 6: 108. 181 5" de Bary, 

 Beltr. Morph. Phys. Pilz. i^ : §xiii. 49. 1870 ; s'acc. Syll. 

 Fung. 1:16. 1882 ; Wint. ; Rabenh. Krypt. Fl. Deutschl. i* : 33. 

 1884; Karst. Act. Soc. Faun. Fl. Fenn. 2 : 93. 1885 ■ Burr & 

 Earle, Bull. 111. State Lab. Nat. Hist. 2 : 404. 1887 I Burr. ; Ell. 

 & Everh. N. Amer. Pyren. 13. 1892 ; Jacz. Bull. I'Herb. Boiss. 

 4: ;3i- 1896; Oudem. Rev. Champ. Pays.-Ba.s. 2: 95. 1897. 



