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



perhaps it may be the same with Cephalotrichum curtum ; but 

 under a magnifier of 600 diameters I cannot see this clearly 

 enough to make it part of the specific character. 



Tab. XIIL fig. 16. a, S. nigrella, nat. size ; b, c, single plants ; d, sporidia, 

 highly magnified. 



*227. Sporocybe alternata. Aspergillus alternatus, Berk., 

 Ann. of Nat. Hist., vol. i. p. 262. This species, on more ma- 

 ture reflection, certainly belongs to the genus Sporocybe, as 

 the sporidia are not arranged in moniliform threads. 



228. Sporocybe lobulata, n. s. Atra, filis prolifere ramosis ; 

 ramulis subalternis attenuatis ; apicibus 4 — 5 lobulatis ; spo- 

 ridiis ellipticis, echinatis laevigatisque, binucleatis. On a 

 coarse linen cloth on a heap of rubbish. King's ClifFe. 



From the articulated creeping mycelium spring slender very 

 minutely scabrous threads, branched proliferously ; ramuli 

 often alternate, attenuated, their apices swelling into a pyri- 

 form 4 — 5-lobed receptacle, from which spring elliptic sporidia, 

 some of which are echinulate, others smooth with two nuclei. 



Nearly allied to the last, but it is at once distinguished by 

 the lobed tips of the branchlets. It appears also to have a 

 great resemblance to Stachybotrys atra, Corda, but the lobes 

 are not so distinct; neither are they mammillate, and the sporidia 

 have no true septum. There is a species of Periconia ( = Spo- 

 rocybe, Fr.), figured by Corda, with a lobed receptacle, but 

 very different in other respects. 



Tab. XIIL fig. 17. a, Portion of S. lobulata; b, a portion of one of the 

 threads ; c, one of the lobed tips ; d, sporidia : all highly magnified. 



229. Helicosporium vegetum, Nees. Syst. p. 68. f. 69. On 

 decayed oak branches. Morehay Lawn, in Rockingham Fo- 

 rest, Norths. 



*230. Helminthosporium Tilice, Fr. Syst. Myc. vol. 3. p. 361. 

 Dr. GrevihVs figure does not give a good notion of this plant, 

 which is certainly an Helminthosporium. Besides the filiform 

 and clavate flocci, there are distinct oblong biseptate sporidia, 

 supported by a minute peduncle. 



Tab. XIII. fig. 18. a, flocci; b, sporidia: highly magnified. 



231. H. foliculatum, Corda, Ic. fasc. 1. t. 3. fig. 180. On 

 stems of umbelliferous plants and cabbage-stalks. King's 

 ClifFe. 



232. H. obovatum, n. s. Floccis subulatis, multi-articulatis, 

 subsequalibus ; sporidiis obovatis, fuscis, biseptatis. On old 

 planks exposed to wet. 



Forming a short dense velvety-black stratum ; flocci very 

 slightly attenuated, subulate, either nearly straight or slightly 

 flexuous. Sporidia broadly obovate, with two dissepiments, 



