364 Rev. M. J. Berkeley on British Fungi. 



Phoma. P. salignum and P. pustula, it is to be observed, are 

 species of Sphceria, possessing perfect asci. 



198. Dothidea Sphcerioides, 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. Ch&tomium, Kz., Fr. Syst. Myc. 2. p. 563. On 

 leaves of different species of Rubus, but especially R. Idceus 

 and P. ccesius. 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 Linnaean Society of Paris, 

 where they are drawn as clavate, with a septum. 



Tab. XI. fig. 4. Spores of A. Padi highly magnified. 



202. A. Rosa, 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. 



Tab. XI. fig. 5. Spores of A. Roses highly magnified. 



203. A. labes, n. s. Maculis indefinitis, fuscis, non fibril- 

 losis ; gelatina 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 



