284 FUNGI. [Thajnnomyces, 



f. 1 Xyloina salignum, Pers. Si/n. p, 106. Dec. Mem. du Mus, 



2. p. 325. Moug. ^ Nest. ! n. 268. Grev. Fl. Ed. p. 368. 

 Jolinst. FL Berw. 2. p. 139. 



On fallen Sallow leaves. Winter and spring. Sowerby, Grevilh, 



Johnston Sph. Populi, Sow. ! t. 372. f. 2., is certainly nothing more 



than Sclerotium popuhieujn. There is not in the original specimens 

 the slightest trace o^ nuclei. 



2. P. Ddhlicc, Berk. (^Dahlia-stem Phoma) ; scattered rufes- 

 cent subpellucid subhemispherical covered by the epidermis 

 which at length bursts in the centre, sporidia oozing out and 

 forming a subglobose mass. 



On decaying stems of Dahlias. Winter. Apethorpe, Norths. 



Rev. M. J. Berkeley Perithecium none. Sporidia turgid, pellucid, 



elliptic. 



3. P. Pusiula, Pers. (Oak-leaf Phoma) ; unilocular convex 

 even reddish-brown white Mithin, nucleus black. Fr. Syst. 

 Myc. V. 2. p. 547. Scler. Suec. > n. 205 — >S'. pustula, Pers. Ann. 

 d. Bat. 11. t. 2./ 7. b. Syn. p. 91. 



On fallen oak leaves. Very common. — This species does not 

 answer to the character o^ Phoma, as it has certainly true asci. I find 

 the structure of the plant, in Fries' published specimens, precisely the 

 same as in my own. The nucleus appears to me surrounded by a very 

 thin delicate, dark sac, whence perhaps arises its black colour when 

 the tubercle is cut across, and within this exist distinct clavate asci 

 containing oblong sporidia. Can it be an immature or sub-abortive 

 state of Sphceria tubceformis ? In that the asci are extremely broad, 

 and the sporidia rather elliptic than oblong. 



4. P. Hederoi^ Desm. (Ivy Phoma) ; covered black, sporidia 

 hyaline subglobose. Desm. PI. Crypt, n. 350. (Jide Moug, ^ 

 Nest. ! n. 979.) Fr. El. 2. p. U 9. 



On small dead shoots of Ivy. Cambridge, 1823. Woodnewton, 

 Norths. Rev. 31. J. Berkeley — Covered with the blackened epidermis, 

 which is pierced with a ragged round or linear orifice. Sporidia black, 

 not truly globose. 



62. Thamnomyces. Ehrb. Thamnomyces. 



Pseudoperithecia subrotund, formed from and supported by 

 tlie shrubby stroma, furnished in the centre with a mass of free 

 sporidia. — Name from Cu/xvog, a shrub, and Atyx?;,', afimgus. 



1. T. hippotrichoides. Sow. (horse-hair Thamnomyces); stroma 

 crectbranchedblackexternally,minutelyverrucose, white within, 

 pale at the apices, pseudoperithecia lateral subovate. Ehrb. 

 Hot. Phys. Ber.p. 82. — Sph. hypotrichoides, Sow. ! t. 200. — Hy- 

 poxylon loculiftrum. Bull. t. 195./. 1. 



On an old sack of sawdust in a wine cellar. Wisbeach, Mr. Jonathan 

 Peckover. On matting made of Scirpus lacustris. May 1815, in a 

 damp pew at Cobham Church, Kent, l)r. Leach. — Ehrenberg gives as 

 part of his generic character " caudices medio cavi," but as this does 



