189 



^ 



by a ring of smaller ones: 1'uckel suggests that in this case the 

 central one is a young ascophore, but no evidence in favour of 

 this idea could be found in the specimens examined. 



This is said to be the pycnidial stage of Cenangium populinum, 

 FckL, but there seems to be some confusion here. Fuekel 

 issued two fungi as imperfect stages of his C. populinum, both 

 on P. tremula — no. 2566, which is the present species, and no. 

 1839! which is different {see Symb. Myc. p. 268, and Nachtr. 

 ii. 55). 



Phoma Crepini bears much resemblance to certain species of 



Permateae; it has a decided basal stroma, and should therefore 

 be placed in Diothella. D. populae, Sacc. SylL iii. 2-S7 

 (Sydow, Mycoth. March, nos. 417 ! and 1022!) is similar in some 

 respects, apart from the spores, but the pycnidia are fewer, 

 larger, dull brownish-black, and present a very different 

 appearance to the eye. D. populnea, Thiim., however, can 

 hardly be anything but D. Crepini, though no specimens of it 

 have been seen : if so, the name of the species should be that 

 given by de Thumen, 



SPECIES TO BE TRANSFERRED TO CYTOSPORA. 



432. Phoma aHostoma, Sacc. 



Sphaeropsis allostoma, Lev. Ann. Sci. ]S"at. 1846, v. 294. 



This is represented in Berkeley's herbarium by a specimen 

 from the Botanic Gardens at Paris, named in Leveille's own 

 handwriting, on the bark of a large trunk of Taxus baccata. It 

 is evidently a Cytospora, and appears to be identical with C. 

 Taxi, FckL, differing only in the fact that the pustules measure 

 about 1 mm. across (instead of 2-3 mm.). The spores, however, 

 are hardly "curved/ 1 but elliptic-linear and straight, though 

 of about the right size. The fungus described under this name, 

 P. aliostoma, by Diedicke (Pilz. Mark Brand, p. 178) is obviously 

 something quite different from this specimen of Leveille, the 

 pycnidia being given as 90-150 /u diam., and the spores being 

 different. 



jy 



Description of Leveille's specimen, €€ Sphaeropsis allostoma. 



Conceptacles scattered or gregarious, 1-1-5 mm. broad, very 



convex, covered, then emergent, irregular, black, the *broad 



dingy-black disc pierced with one ostiole (rarely more) and sur- 

 rounded by the laciniae of the bark: within is a sinuous chamber, 

 surrounding a whitish columella (not always present) ; contents 

 horny, grey. Spores very numerous, elliptic-linear, straight or 

 in profile faintly curved, 6-8 x 1-5-2 /i, supported on straight, 

 crowded sporophores longer than the spore. (Fig. 9). 



o 



Spores from Leveille s specimen. 



The only specimen of Valsa Taxi^Fckl., I and II, that I have 

 seen (FckL Fung. Khen. no. 2347!) is very poor, but does not 





