DECADES OF FUNGI. 233 



obtuse. Sporidia clavate, uniseptate, constricted in the centre, about 

 • g o^Q - Q of an inch long. When dry, the sides of the perithecia contract, 

 so as to give the mass a sort of reticulated appearance when examined 

 under the compound microscope. 



This curious parasite has a very different appearance from D. Pieridis, 

 being far less compact. It is certainly merely a form of the plant of 

 Dr. Montague from Otaheite, on some species of Adiantum, though the 

 perithecial prominences are more minute, and the spores shorter. In 

 Dr. Montague's plant, in which the fructification is not very perfect, I 

 find a hyaline coat to the sporidia, a circumstance which cannot be 

 regarded as of specific importance. The difference in habit, and the 

 slight decrease of size in the sporidia, probably depend upon the dif- 

 ferent matrix. The same species also occurs in New Zealand. 



499 a. B, exsculpta, n. s. ; stromate orbicular! nigro margine radi- 

 atim exsculpto; ostiolis papiUseformibus centralibus. 



Hab, On the under side of leaves of Agyneia muUihcularis. Ceylon. 

 (G. H. K, Thwaites, Esq.) 



Stroma orbicular, a line or more broad, delicately grooved, with 

 forked and intermediate lines, so as to resemble the hymeniura of a 

 Lenzites in miniature. Ostiola papiUaeform, central often numerous. 



I have not seen this very curious production with perfect cells, much 

 less with fruit. The habit is however so curious, that it cannot fail to 

 be recosmized. The substance is brittle and carbonaceous. 



500. D, TJiwaitesii, n, s.j pustulis nitidis cum matrice continuis ; 

 cellulis irregularibus ; ascis lineari-clavatis ; sporidiis hyalinis oblongo- 



clavatis. t 



Hab. On leaves of some Cyperacea. Ceylon. (G. H: K. Thwaites, Esq.) 

 Pustules oblong, subelliptic, pitch-brown, shining, scarcely raised 



above the surface; Cells irregular. Asci linear or clavate. Sporidia 



uni-bi-serlate, narrow, oblongo-clavaeform. 



Eesembling somewhat SpJiceria Salzmanni, Dalz., and very distinct 



from anaWous forms on Grasses and Sedges. 



Fungi described in the fifth Cenlunj now completed. 



iSlcidium ecliinaceum^ Berk. 



„ Fa'oett^e^ ih. 



'hytismoideum^ id. 



AgtiYicm fulviceps, ib. 

 „ K/iasiensis, ib, 

 „ moniostiSy ib. 



VOL. VI. 



2 Tf 



