122 The Scottish Naturalist. 



On dead stems of Rhinanthus crista-galli, in spring. 

 On the Links near Aberdeen. 

 Dee. 

 Pycnidia scattered, subcutaneous, but erumpent, ^ mm. across, 

 flattened spheres in form, becoming umbilicate, papillate ; 

 dark, texture firm ; sporidia oblong, straight or curved, 5-6 

 by 1^-2 J, hyaline, biguttulate. Pycnidia much like the 

 perithecia of Pleospora herbarum, which is plentiful on 

 the stems of the same plant. Is it possible that they are 

 stages of development of the same fungus ? 

 *22. P. Asteriscus, Berk., 753, C. 113, M. 1092. (D. Jerdon.) 

 On dead stems of Heracleum Sphondylium. 

 Tweed (Jedburgh), Dee (Aberdeen). 

 *23. P. herbarum, West, 793, C. 125. (D. and R. Trail.) 

 On dead stems of various plants, frequent. 

 Dee. 

 This is a very unsatisfactory plant, and probably includes the 

 spermogonia of a good many Pyrenomycetes, but especially 

 of Pleospora herbarum. On the other hand, it is scarcely 

 possible to distinguish several other named kinds of Phoma 

 from varieties of P. herbarum. 

 Pycnidia subgregarious, at first subcutaneous and globoso-de- 

 pressed, then erumpent, and subumbilicate, papillate, dark, 

 sporidia elliptical or oblong, hyaline, biguttulate, size from 

 5 by 3 to 10 by 4. 

 "*24. P. acuta, Fuck., 794, C. 126. (D. and R. Trail.) 



On dead stems of Urtica dioica (Common Nettle), along 

 with Leptosphaeria acuta, of which it seems to be the 

 spermogonium. 

 Dee. 

 Pycnidia scarcely different in appearance from the perithecia of 

 L. acuta, papillate ; sporidia oblong, about 5 by i|-, hya- 

 line, biguttulate. 

 25. P. nebulosa (Pers.)j Mont. 801, C. 130, M. 1094. (D. & 

 R. Greville.) 

 On dead herbaceous stems. 



Tweed (Berwick), Forth (Edinburgh). 

 *26. P. melaena (Fr.), M. and Dur. 804. (D. and R. Trail, 

 Sc Nat. 1887, p. 90.) 

 On dead stems of Astragalus glycyphyllus. 



