120 The Scottish Naturalist. 



(Note. This is a very large and unsatisfactory genus, some 

 species verging towards Coniothyrium in colour of the sporidia, 

 others towards Ascochyta in the sporidia being often uniseptate, 

 and others towards Scolecosporae in the long slender sporidia. 

 The species are very hard to distinguish ; and, probably, many of 

 the named forms are not distinct from one another, save in name. 

 The fungi referred to Phoma are in most cases early stages of 

 Pyrenomycetes of various groups, e.g., Diaporthe, Pleospora, Pko- 

 matospora, &c. The sporidia vary a good deal in size. Those 

 species in which they exceed 15 in length have recently been 

 placed by Berlese and Voglino in a separate genus, Macrophoma ; 

 but this differs from Phoma in no other character than size of 

 sporidia, and does not deserve higher than sub-generic rank. 



Subgenus I. eu-phoma. 

 a. On Woody Stems of Dicotyledons. 



*i2. P. Ryckholtii, Sacc, 484, C. 8. (D. and R. Trail, no- 

 previous record.) 

 On twigs of Symphoricarpus racemosas (Snowberry) in winter- 

 Dee. 

 This precedes or accompanies Diaporthe Ryckholtii, of which it 

 is the spermogonium, near Aberdeen. Pycnidia subcu- 

 taneous, depressed ; sporidia fusiform, obtuse, 7-9 by 2-3,. 

 * hyaline, with 2 guttuke ; basidia rather long. 



#13 P. Xylostei, Cooke and Harkness, 405, C. 9. (D. and R. 

 Trail, no previous record.) 

 On twigs of Lonicera Periclymenum (Honeysuckle). 

 Dee (near Aberdeen). 

 Pycnidia scattered, subcutaneous, prominent and dark ; sporidia 

 oblong, or nearly elliptical, 5-7 by 2-3-3, hyaline. 

 *i4. P. Callunse, Karst., 500. (D. and R. Trail, So. Nat., 1887, 

 p. 90.) 

 Common on dead stems oiCalluna vulgaris, near Aberdeen. 

 Dee. 

 Pycnidia scattered, about \ mm. across, subcutaneous, depressed- 

 spherical, but prominent, dark ; sporidia elliptical, obtuse, 

 hyaline, 12-13 D y 6. 

 *I5. P. pulla, Sacc, 511, C. 47. (D. and R. Trail, no previous 

 record.) 

 Common on dead twigs of Hedera Helix (Ivy), near Aber- 



