191 



colourless. Those of the Alabama specimen are not all hyaline, 

 as Berkeley and Curtis assert; many of them have the yellowish- 

 brown colour habitual with young D. Pinastri and its typical 

 curved or irregular outline, and I found in the pycnidia at 

 least one spore which was brown and uniseptate. 



Phoma macrosperma (Karst.) Sacc., on Abies excelsa, is a 

 similar fungus, and presumably also a Diplodia; and the same 

 may be said of P. exceha, Karst., but about these (no specimens 

 being available) only suggestions can be made. The old system 

 of putting all such Sphaeropsidales in Phoma, without paying 

 any regard to the character of the spores, if only they were 

 continuous and colourless, is now thoroughly discredited ; to 

 those who are familiar with the forms even the young spores 

 display many signs which are significant of their future fate. 



434. Phoma persicina, Sacc. 



Diplodia persicina, Grove. 



Sphaeropsis persicina, Berk. & Curt, in Grevill. 1874, iii. 1. 



Macrophoma persicina, Berl. & Yogi, in Sacc. Syll. Addit. p. 

 307. 



r 



Diplodia Persicae, Sacc. in Mich. ii. 267 (1881); Syll. iii. 341. 



Pycnidia crowded, round, flattened, lens-shaped, then sub- 

 globose, 120-250 pi diam., shining, black, covered, then just 

 piercing' the epidermis by the short papillate ostiole round which 

 a whitish circle is left; texture rather thick and dark. Spores 

 oblong, straight or faintly curved, obtuse at the ends, not 

 thick-walled — pale-brown, continuous, 1-2-guttulate, 16-18 x 

 7-9 /jl (in Berkeley's specimen) — dark-brown, 1-septate, some- 

 times gently constricted, 18-20 x 9 a (in Roumeguere's speci- 

 men). (Fig. 11). 



D. persicina, from Berk. no. 3422 $ nearly all the spores were 



pale brown. 



On twigs of Persica, Pennsylvania (Sphaeropsis persicina. 

 Herb. Berk. no. 3422!); on thin twigs of Persica vulgaris, 

 France (Fautrey, Bouni. Fung. Gall. sel. no. 5282!); Gonegliano, 

 Italy (Sacc). 



These are evidently the same species, the pycnidia as usual 



being larger on the thicker twigs, and the spores passing through 



the series of colours and forms characteristic of a Diplodia. 



455. Phoma fusigera, Sacc. 



laeropsis fusigera, Berk. & Curt, in Grevill, 1874, ii. 181. 

 Macrophoma fusigera, Berl. & Vogl. in Sacc. Syll. Addit. p. 



312. 



This " species M is a mixture of two specimens, which, by 

 inadvertence, Berkeley confused together. Both are, perhaps. 



