The Scottish Naturalist. 



323 



437 = Lecythea Saliceti Lev., M.S., 1309, p.p.). Summer 

 — Autumn III. Autumn and winter. 



Tweed, Solway ! Forth ! Clyde ! Tay ! Argyle ! 

 Dee ! Moray ! Ross, Orkney ! 

 t 1 7. M. tremulse Tul. On leaves of Populus tremula ! Autumn 

 — Winter! (M.S., 1302.) 



Forth \ Clyde I Tay! Dee! Moray! 

 The leaves of young aspens are not unfrequently covered with 

 the golden Uredospores of this fungus. The teleutospores are 

 matured during winter on the fallen leaves. Hartig has suggested 

 that Cceoma Laricis {See No. 137) is the secidium of M. tremuloe ; 

 but Plowright failed to trace the connection in cultivation of the 

 spores. I have found the two species growing in suggestively 

 close proximity at Maidencraig, near Aberdeen. 



1 17a. M. secidioides (D.C.), which grows on Populus alba, has 

 not yet been discovered in Scotland ; but it is noticed here since 

 Plowright (I.e., p. 242) states, as the result of his experiments, 

 his belief that the secidium of this species is Ceoma Mercurialis 

 (No. 135), which is not rare in Scotland. The distribution of the 

 latter in Scotland appears adverse to this view, however. 



118. M. populina (Jacq.). On leaves of Populus nigra ! and 

 P. balsamifera ! 



II. (=Uredo populina Greville, Flor. Edin., p. 442). 

 Summer — Autumn ! 



III. (M.S., 1 301). Autumn — winter ! 



Tweed, Forth ! Clyde ! Tay ! Dee ! Moray ! Ross. 

 The distribution of this fungus in Scotland does not agree 

 with the supposition that its aecidiospores occur on Clematis as 

 suggested by Rathay, or on Allium, as Schroter supposes. 



119. M. betulina (Pers.). On leaves of Betula ! 



II. ( = livedo ovata Greville, Flor. Edin., p. 442). Summer 

 — -Autumn ! 



III. (M.S., 1303). Autumn — Winter ! 



Tweed, Forth ! Clyde ! Tay ! Argyle / Dee ! Moray ! 

 The uredospores frequently render almost every leaf golden- 

 yellow. The teleutospores do not directly infect young leaves of 

 birches ; but no secidium has yet been traced. 



120. M. Hypericorum (D.C.). On Hypericum pidchrum. 



II. (Uredo Hypericorum D.C, M.S., 1285). July— Sep- 

 tember. 



