270 The Scottish Naturalist. 



210. M. bicolor Nees., 3963, C.650, M.1174. 



On dead branches of Betula alba (Birch). 

 Tweed, Tay, Argyle. 



XLIII. Didymosporium Nees. 

 Pustules subcutaneous, soon erumpent ; sporidia oblong or 

 fusoid, fuscous or sooty, said by Saccardo to be i-septate, 

 by Cooke to be unicellular. 



21 1. D. profusum Grev., 4009, C.656 (D. & R. Greeille). 

 On bark of Acer Pseudo-plat anus ', near Edinburgh. 



Forth. 



XLIV. Marsoxia Fisch. 



Pustules subcutaneous, subdiscoid, pale ; sporidia ovoid, oblong 

 or subfalcate, uniseptate, hyaline. 

 *2i2. M. Potentillae (Desm.) Fisch., 4037, C.646, Sc. JS T at. 

 1887, p. 89-90. 

 var. Tormentillae Trail, on Potentilla Tormentilla. 

 Anserinae Trail, on P. Anserina. 

 Oomari Trail, on P. Comarum. 

 Dee (near Aberdeen). 

 *2i3. M. Melampyri Trail, 8c. 2Va&, 1887, p. 89. 

 On leaves of Melampyrum pratense, at Dinnet. 

 Dee. 



214. M. Juglandis (Lib.) Sacc, 4028, C.645, M.1096 (sub 



Leptothyrium Juglandis), (D. Stevenson). 

 On leaves of Juglans regia (Walnut). 

 Tay (Glamis). 



XLV. Stilbospora Pers. 



Pustules subcutaneous, conoid or discoid, dark ; sporidia oblong 

 or fusoid, 2-pluri-septate, sooty brown, at last extruded, 

 and staining the bark dark. 



215. S. macrosperma Pers., 4046, C.659 (D. Carmichael). 



In bark on branches of Quercus Robus (Oak). 

 Argyle (Appin). 



* 



XLVI. Coryneum Nees. 

 Pustules discoid or pulvinate, subcutaneo-erumpent, dark ; 

 sporidia oblong or fusoid, 2-pluriseptate, sooty brown, 

 never escaping in tendrils ; basidia rodlike, variable in 

 length. 



