Melanconium.] FUNGI. 367 



On twigs of beech. Extremely common. — Easily known by its stellate 

 pointed conical sporidia. 



2. S. ovdta, Pers. (ovale Stilbospora) ; stroma scarcely any, 

 sporidia ovate triseptate, septa sometimes obsolete. Pers. Obs. 

 1. t. 2. /. 2. Grev, Sc. Cr. FL t. 212. /. 2. Fr. Syst. Myc. 

 r. 3. jo. 485. — Stilbospora pyriformiSf Hoffm. Fl. Germ. 2. t, 13. 



f. 2. Fr, ! Scler. Siiec. n. 214. 



On sticks. About Edinburgh, Dr. Greville. Oundle, Norths. 

 Rev. M. J. Berkeley. — My specimens accord exactly with those 

 published by Fries, being ovate or, more correctly speaking, obovate, 

 3-septate, minutely truncate at the base and sometimes elongated, as 

 if in an early stage of growth they were pedicellate. Dr. Greville's 

 plant has no septa, and he informs us that the sporidia are shorter than 

 in that of Fries. 



3. S. magna. Berk, (large Stilbospora) ; sporidia oval or sub- 

 ovate not septate. — Ncemaspora magna, Grev. Sc. Crypt. Fl. t, 

 349. — N. carpi?iea, Baxt. ! n. 76. — Sphceria Carpini^ Sow. t. 

 376. Purt. V. 3. p. 286. 



On trunks of hornbeam and walnut. Not uncommon^ Sometimes 

 covering the whole trunk. — This species comes nearest to ^S". ovata, from 

 which, however, it is very different. I refer it to the present genus, 

 rather than to Melanconium, on account of its rather large, decidedly 

 ovate sporidia. As a species, it is very distinct and not a mere form 

 of various species, with the sporidia oozing out in long tendrils, in con- 

 sequence of some particular conditions of moisture. 



145. DiDVMOSPoRiUM. Nees. Didymosporium. 



Sporidia uniseptate, glued together into a nucleus, without 

 any perithecium, at length bursting forth and free. — Name, 

 bid'jfug, double, and o'rrooog, seed. 



1. P. p7'ofusum, Grev. (profuse Pidymosporium) ; stroma 

 none, sporidia oblong uniseptate very minute black. Grev. 

 Syn. Gen. c^- Sp. p. 3. Fr. Syst. Myc. v. 3. p. 489 Stilbo- 

 spora profusa, Grev. Sc. Crypt. Fl. /. 212./. 1. 



On branches of sycamore. About Edinburgh, Dr. Greville. Ap- 

 pin, Captain CarmichacL 



2. D. flcvdtum, Lk. (raised Pidymosporium) ; stroma sub- 

 conic pallid, sp(U"idia oval. Lk. Sp. )1. p. 94. Fr. Syst. Myc. 



V. 3. p. 486 D. betulinnm, Grev. Scot. Crypt. Fl. t. 273. — 



Melamonium bctulinum, Moug. ^ Nest. ! n. 670. Scler. Sncc. f 

 n. 299. 



On twigs of birch, common. 



146. Melan'coxil'.m. Lk. Melanconium. 



Sporidia globose (or subgiobose) simple, glued together into 

 a nucleus without any perithecium, at length oozing fortli and 

 free. — Name, (lO.u;, black, and xow;, dust. 



