*248 FUNGI. {Spharia. 



fibrous crust. Stroma ^hxons. Contents of the /jertV/^f^cm blackish. There 

 is very little difference except in habit between this and the supposed 

 form of S. extensa described above ; the latter splitting the cuticle 

 transversely, whereas this merely raises it into little subelliptic in- 

 equalities. 



Div. 10. Incuse. {Named from the stroma heing^ as it were, 

 set in the conceptaculuni.) Stroma formed from the hark contained 

 in a dimidiate patelliform conceptacidum, and covered above hy the 

 subconnate epidermis, through which it at length bursts by a wax- 

 like disc. Ptrithecia irregularly disposed in circles, more or less 

 crowded in the centre of the stroma and piercing it by the rather 

 short ostiola, 



59. S. nivea, HofFni. (^snow-ivhite Sphceria) ; conic, stroma 

 white contained in a close dimidiate conceptaculuni, which easily 

 separates from the bark, disc truncate mealy almost snow-white, 

 ostiola slightly prominent globose even. Hoffm. Veg. Crypt. 

 t. 6./ 3. With. V. 4. p. 338. Moug. ^ Nest. ! n. 278. Purt. / 

 V. 3. n. 1526. Hook. Scot. 2. p. 6. Fr. Syst. 3Ijjc. v. 2. p. 386. 

 Scler, Suec. ! n. 76. >S'. marginata, Sow. I t. 372. f. 7. Stro- 

 ^natosphceria nivea, Grev. Fl. Ed, p. 358. S. leiicostoma, Johnst, 

 Fl. Beriv. 2. p. 122. 



On branches of various trees, but especially poplar and hawthorn. 

 Common. — Sp. nivea, Sow. ! is clearly S. ovina ; a false reference 

 being made to Hoffmann. It can only be by a slip of the pen that 

 Fries has referred to it, as the figure alone is quite decisive. The 

 plant is however figured by Sowerby under the name given above from 

 specimens on Popalus Treraula communicated by j\Ir. Templeton. 

 According to specimens, S. nivea, Grev. I. c, is S. leiphcRmia, but 

 possibly there may be some mistake in the labelling. 



60. >S'. leucostoma, Pers. (ivhite-moiUhed Sphceria) ; somewhat 

 conic, stroma cortical contained in a close dimidiate concepta- 

 culuni, disc truncate white, perforated by the black poriforni 

 ostiola. Pers. Syn. p. 39. Nees, f. 332. Fr. Syst. Myc. 

 V. 2. p. 387. Scler. Suec. ! n. 258. Purt. MSS. S. pustu- 

 lata, Moug. ^' Nest. ! n. 659. S. talus, y. pileata^ Tode, Fung. 

 Mcch.f. 96. 



On the branches of different species of P;v/?j?/5. Very common. — 

 *' At first altogether resembling a Cytispora with 1 — 2 black included 

 ostiola, but when perfect bearing many minute exserted now and then 

 slightly prominent ostiola. It differs from the foregoing in the nature 

 of the disc, the obliterated stroma, and the more adnate conceptaculuni." 

 Fr. I. c. 



61. S.anguldta, Fr. {ringed Sphmria) ; loosely circumscribed, 

 stroma cortical, perithecia few crowded in the centre, disc plain 

 black, ostiola exceedingly small. Fr. Syst. Myc. v. 2. p. 390. 

 Scler. Sued n. 72. El 2. p. 76. Stromatosphceria nigro- 

 annidata, Grev. Fl. Ed. p. 358. 



On branches of beech, birch and lime. Edinburgh, Dr. GreviUe. 



