364 Rev. M. J. Berkeley on British Fungi. 
Phoma. P. salignum and P. pustula, it is to be observed, are 
species of Spheria, possessing perfect asci. 
198. Dothidea Spherioides, Fr. Syst. Myc. 2. p.552. On 
dead twigs of ash. Common. 
199. D. pyrenophora, Fr.1.c. On fallen apple and pear 
trees. King’s Cliffe, Apethorpe. These two species belong 
to Fries’s genus Dothiora, which is, I believe, at present not 
characterized. 
200. D. Chetomium, Kz., Fr. Syst. Myc. 2. p. 563. On 
leaves of different species of Rubus, but especially R. [deus 
and R. cesius. Grace Dieu, Leic. Mr. Churchill Babington. 
Rockingham Forest. 
*201. Asteroma Padi, Grev.! Fr. El. 2. p. 151. Arisaig. 
Mr. Churchill Babington. Spores at length oozing out, linear, 
very minute, slightly curved. I cannot account for the dif- 
ference between my figure of the spores and that of Madame 
Libert in the Transactions of the Linnean Society of Paris, 
where they are drawn as clavate, with a septum. 
Tas. X1. fig. 4. Spores of 4. Padi highly magnified. 
202. A. Rose, Lib., Erysiphe radiosa, Fr.! Scler. Suec. On 
rose leaves. Autumn. Very common during the present and 
past autumn. 
Fries remarks, that no one has hitherto seen the perithecia 
perfect. Madame Libert, however, figures spores in the 
Transactions of Linn. Soc. of Paris for 1826. My observa- 
tions, however, do not accord with Madame Libert’s, who pro- 
bably used a compound microscope of the old construction. 
They are of a very curious form, consisting of two obovate cells 
attached by their broader ends, and each containing two 
nuclei. 
Tas. XI. fig. 5. Spores of 4. Rose highly magnified. 
203. A. labes,n.s. _Maculis indefinitis, fuscis, non fibril- 
losis ; gelatind subcirrhosa; sporis subpyriformibus, obsolete 
uniseptatis. On poplar leaves. Rushton, Norths., July 1840. 
Forming irregular brown patches, scattered, or occupying al- 
most the whole of the upper side of the leaf. There are no 
distinct fibres, but the stroma when held up to the light and 
examined carefully, is found to be disposed in a fibrillose form, 
so as to resemble the seaweed-like spots in mocha stones. 
Spores forming short tendrils, subpyriform, with an obscure 
septum (not always however visible) at the contracted part of 
the spore. The spores in the fresh plant showed little granules, 
generally disposed in two patches, but when dry I find two 
