1 



142 A MOXOGRAPH OF THE ErvSIPHACEAE 



simply adhered to them. A few perithecia of Phyllactinia corylca 



occur also. 



Professor Miyabe has sent me specimens (now in the Kew Her- 

 barium) of two very interesting forms of M. alni from Japan. 

 These specimens, while certainly belonging to M. alni, are valu- 

 able in showing what marked variations occasionally occur. The 

 first of these forms (on Ligustnim viedium) has often quite colorless 

 appendages and the compact apical branching characteristic of M. 

 alni; in many perithecia, however, the apex of some of the ap- 

 pendages forks widely, the primary branches being sometimes quite 

 long. Not infrequently, also, the appendages are colored^brown 

 near the base, and a few perithecia were observed in which the 

 color, although faint, reached to the base of the apical branching. 

 The other form, on Coryhis rostmta, var. Mandshnrica is more re- 

 markable, and, taken by itself, might certainly be considered dis- 

 tinct. The appendages of most perithecia are rather long, often 

 twice the diameter of the perithecium, and are multiseptate and 

 uniformly colored brown to the commencement of the apical 

 branching. The apical branching is rather irregular, the primary 

 branches being frequently long. Nevertheless, even in this form 

 with usually strongly colored appendages, we get occasionally 

 colorless appendages, and a small compact apex branched in the 

 normal manner for M. alni. The wide branching of some of the 

 appendages of these two forms tends to connect them with the var. 

 divaricata, while the quite sporadic appearance of colored append- 

 ages shows that, in M. alni, no value can be attached to this 

 character. 



Magnus (227) in an interesting and well-illustrated paper on 

 the forms of M. alni, comments on the curious fact that this 

 species is abundant on Syringa vulgaris in North America, while 

 no record exists of its occurrence on this host in Europe. 



~ Var. lonicerae (DC.) [Figs. 19-22] 



Erysiphc lonicerae DC. Fl. Fr. 6 : 107. 1815 ; Tul. Sel. Fung. 

 Carp, i: 205. pi. 2. f. ^. 1861. 



Alphitomorpha divaricata, wax. lonicerae Schlecht. Berl. Gcs. 

 Nat. Freund. Verh. I : 49. 18 19. 



