Rev. M. J. Berkeley and Mr. C. E. Broome on British Fungi. 385 



659. S. (Foliicolse) Leightoni, n. s. Epiphylla; peritheciis 

 subglobosis piceis ostiolo conicoj ascis clavatis; sporidiis oblongo- 

 cymbiformibus triseptatis. On dead leaves of Linnaa Borealis, 

 Glen Dole, Clova, Rev. W, A. Leighton, Aug. 1837. 



Minute, scattered over the upper surface of the leaves, pitchy 

 brown, shining, narrowed into a short conical ostiolum. Asci 

 clavate, sublanceolate ; sporidia oblongo-cynibiform, about four 

 times as long as broad, obtuse, scarcely curved; endochrome at 

 first retracted to either end ; a septum is then formed between 

 the two masses which are at length again divided. 



Plate XII. fig. 43. a. Ascus ; b. sporidia. Both more or less magnified. 



660. Dothidea Piggotii, n. s. Orbicularis innata, superficie 

 cellularum apicibus papillata; ascis brevibus clavatis ; sporidiis bi- 

 serialibus obovato-cymbiformibus 3-septatis. On Pcrmelia saxa- 

 tilis, Beddgelert and Capel Curig, Aug. 1849, H. Piggot, Esq. 



Forming little patches about a line broad, completely adnate 

 with the thallus ; surface opake, black, papillate with the pro- 

 truding tips of the semi-immersed cells, whose walls are black, 

 but separated from each other by pellucid vertical cells running 

 down below into hyaline subhexagonal cells with thick walls. 

 Asci short, broad, subclavate. Sporidia brown, biseriate, obovate, 

 cymbiform, slightly curved, triseptate, or very rarely quadrisep- 

 tate. 



This appears clearly to be of the same category with D. Liche- 

 num, which has however, according to Fries, a different outward 

 aspect and very slender asci. We take this opportunity of de- 

 scribing a magnificent closely allied species, gathered in Central 

 America by Mr. Seeman, and now in the herbarium of Sir \Y. 

 J. Hooker. 



Dothidea hgmenicola, n. s. Oellulis semiliberis totam super- 

 ficiem hymeninam occupantibus granulatis, ostiolo subradiato; 

 ascis subcylindricis ; sporidiis biseriatis oblongis brevibus uni- 

 septatis. On the apothecia of some species of Sticta, Central 

 America. 



Occupying the whole surface of the apothecia, which it renders 

 rough and granular like some pustular Sph&ria. Cells half im- 

 mersed, their upper half very obtuse, minutely granulated ; os- 

 tiolum obscurely radiated. Asci subcylindrical, clavate ; sporidia 

 biseriate, oblong, uniseptate. 



The matter between the cells is composed, as in the last, of 

 longitudinal tissue passing into hexagonal. A state of that spe- 

 cies however occurs in which the cells are entirely submersed, 

 without any hyaline tissue interposed between them. As they 

 contain only imperfect fruit, without any distinct asci or spores, 

 we are inclined to think this arrested in its development and 



