HT:-IERIUM — OSTEEICiX. 2( 



ttan the two middle ones, also a little smaller, 24— oO x 7-0 /i ; 

 paraphyses sl-riider, branched and tinted with olive at the 

 apex. 



On the bark of variLUS trc-ts. oak, chestnut, ■walnut, birch, 

 fMl'phir, &c 



51 eoimen examined from Fries' Sclerom. scec, n. 61. 



Tue sj'ores are somewhat variaLle, the most general and 

 typical f.'jrm being the one described above, sometimes all 

 f'-'ir cells cif the siorcs are colonred dark brown, sometimes 

 tbiLe only, one end-cell alone remaining paler. Sometimes 

 1 septum only is present at maturitv, sometinits 2 ; in very 

 rare cases 4 S;pta are present. 



Hysterium angostatiim.. A. & .S.. Consp. Fung. 



Xisk.. p. .55; Cke., Hdbk^ p. 753; sacc., .';\U., n. 563o : 

 Eehm, Kiypt-Flora, Hyst., p. 14. 



AscopLores gr-egarioi;= or e^^.■w.led, ■ ften parallel, at first 

 partly immcrsei. then superficial, tensile, ellipticil, some- 

 time; very short and almost round, straigh: or slightly 

 carved, almost smooth. Ijlack, opaque, slit closed, 1—3 mm. 

 long, -— _ mm. broad : asci clavate, wall thick upwards, 

 S-spored ; spores el jez ael elliptical, ends rounded, 3-septate, 

 rarely more, pale brown it maturity, smooth, cells usually 

 l-giittolate, 17-23 X 6-7 ft.; paraphyses slender, branched 

 above. 



On the bark of varioms trees, as oak, birch, &c. 



M. pvlicare superficially resembles the present specie;, but 

 is dis:inguiihed by the two end-cells of the spores "i.eing 

 paler in colour than the central ones. 



Specimen in Behm's Asiom., n. 214, examined. 



OSTBEIOX. Duly. (fig. 31, p. 22.) 



Ascophore suj^rficial, oyster-shaped, rather narrowed at 

 the base or sulstipitate, vertical, latera ly more or less com- 

 pr-.ssed, black, dehiscing by a narrow, elongated sUt, carbo- 

 naceous ; asci subcylindrical, usually 4-spored ; spores very 

 large, elongated, coloured, multiseptate and muriform ; para- 

 phvses present. 



Oiti-tlon, Duty, Hyst.. p. 21 (incorrectly written 0«<reieA- 

 nion); .Sacc, Syll., ii. p. 765. 



