SPIL3EEIACEI. 



92' 



This parasite was growing on the interstices of the areola3 of the thallusof 

 the lichen, and never on the surface. The only specimen observed was col- 

 lected, and is deposited in the Kew Herbarium. Xo mention whatever is 

 made by the Eev, W. Leighton of any ostiolum, nor is there any indication 

 in tbe figures. In this respect, as well as in the reticulated substance of the 

 perithecia, distinct mycelium, and spherical spores it accords with the pre- 

 ceding species, both of which seem to offer good features for a distinct genus, 

 the absence of ostiolum being sufficient reason to exclude them from the 

 genus Sjjhceria. 



Gen. 362. 



MICROTRYRIUM, Desm. 



Perithecia simple, super- 

 ficial, membranaceous, ad- 

 pressed, scutiform, perforated 

 in the centre ; asci fixed, 

 subclavate. — Desm. Ann. Sc. 

 Nat.xY. (1841),;?. 137. 



{Fig. 402.) 



Fig. 402. 



2790. 



Microthyriuxn microscopicum. 



Microthyrium."' 



Desm. " Microscopic 



Epiphylloiis ; spots large, irregular, greyish ; perithecia scat- 

 tered, minute, flattened, black, somewhat shining, papillate ; 

 asci clavate ; sporidia nearly fusiform, uniseptate, at length tri- 

 septate, hyaline. — Desm. Ann. Sc. Nat. (18-41), xv. ^. 138, t. 14, 

 /. 1. Desm. exs. no. 1092. FcM. exs. no. 190. Cooke exs. no. 282. 

 Cooke, L.F. /?o. 91. 



On leaves of box, evergreen oak, &c. 



Fuckel, in his Symbolse Mycologicse (p. 98, t. iii. f. 11, a. b. c,) makes a 

 •distinct species of the form found on oak leaves, bat, it appears to us, with- 

 out sufficient reason. {Fig. 402.) 



Gen. 363. 



STIGMATEA, Fr. 



Parasitic ; perithecia globose, 

 black, innate, slightly prominent ; 

 nucleus firm, at first mouthless, 

 then with a roundish aperture. — 

 Tul. Carp. \i. p. 28G. 



{Fig. 403.) 



Fig. 403. 



