234 The Scottish Naturalist. 



. ScoLECOSPORiE Sacc. 



Sporidia filiform or rodlike, one-celled or septate, hyaline. 

 Pycnidia clypeate, margin fringed with radiating cells, no ostiole. 



Actinothyrium. 

 Pycnidia elongate, longitudinally slit, hysterioid. Leptostromella. 



XXVI. Leptothyrium Kze. & Schm. 



Pycnidia as above, membranaceo-carbonaceous, with ostiole absent 

 or variously formed, dark, composed of radiately 

 arranged cells, and readily falling off after a time ; in 

 some, no true pycnidium is formed, but its place is taken 

 by the dark altered epiderm, (thus forming a transition 

 to Melanconiece) ; sporidia ovoid-oblong or fusoid, one- 

 celled, hyaline. 

 163. L. Periclymeni (Desm). Sacc 3330, C. 557, M. 1099 (sub 

 L. pictum. B. and Br.) (D. Stevenson, J?. Berkeley & 

 Broome, 1875.) 

 On leaves of Lonicera. July-Nov. 

 Tay (Glamis, Fascally). 

 *i64. L. alneum (Lev.) Sacc. 3333, C. 558, S. M. 2177 (sub 

 Melasmia alnea Lev.) 

 On living leaves of Alnus glutinosa (Alder), summer and 

 autumn. 



Forth, Tay, Dee. Moray. 

 (Figured by Greville in Fl. Crypt. Scot. t. 146, f. 2). 

 *i65. L. acerinum (Kunze) Corda, 3351, C. 563, M. 1123 (sub 

 Pilidium acerinum Kze) (D. Jerdon). 

 On dead leaves of Acer Pseudoplatanus. 



Tweed (Jedburgh), Dee (near Aberdeen). 

 I have found, near Aberdeen, on dead Oak leaves (Quercus 

 Robur), lying beside affected leaves of Acer, fungi not in 

 any way distinguishable from this species. 

 ^166. L. vulgare (Fr.) Sacc, 3370, C. 565. 



On dead stems of Epilobium angustifolium (Willowherb) at 

 Kingcausie, near Aberdeen. October. New to Scot- 

 land. Dee. 

 Pycnidia in groups, oval or nearly circular, 250-400 diam., readily 

 falling ; sporidia fusoid, straight, or curved, obtuse, 7-8 

 by 1-J-2, hyaline. 

 England, Europe, Siberia. 



