HYSTERIOGRAPHIUM. 29 



very obtuse, slit narrow ; asci more or less cylindrical, 

 slender, 8-spored ; spores xmiseriate or sometimes with an 

 approach to a biseriate arrangement above, elliptical, ends 

 obtuse, constricted at the middle, 5-septate then muriform, 

 clear olive-brown when mature, 17-21 X 7-10 jx ; paraphyses 

 slender, branched and tinged yellow towards the apex. 



Hysterium Bousselii, De Kotaris, Pir. 1st., p. 19; Cke., 

 Hdbk., p. 758. 



On old weathered pine planks, &c. 



Keadily distinguished by the narrow, cylindrical asci, and 

 the small, few septate, constricted spores. 



Specimen examined from Fuckel's Fung. Ehen., exs. 

 n. 751. 



Hysterographium fraxini. De Not., Pir. later., 

 p. 22; Eehm, Krypt.-Flora, Hyst., p. 10; Sacc, Syll., ii. 

 n. 5758. (figs. 32-33, p. 22.) 



Scattered, or more frequently closely gregarious, lying at 

 all angles, black, hard, erumpent, elliptical, ends usually 

 obtuse, sometimes rather acute, lips rounded and obtuse, slit 

 narrow, elongated, 1J-2J mm. long by 1 mm. broad; asci 

 broadby cylindric-clavate, apex rounded, base short, stout, 

 thick- walled, 8-spored ; spores elliptical, ends obtuse, scarcely 

 or not at all constricted at the middle, about 5-septate then 

 muriform, olive-brown at maturity, 35-45 X 15-20 /x ; para- 

 physes slender, branched and tinged with brown at the 

 apex. 



Hysterium fraxini, Persoon, Synops. Fung., p. 98 ; Cke., 

 Hdbk., p. 759, fig. 359. 



On dry branches of ash, has also occurred in this country 

 or elsewhere, on hazel, walnut, privet, beech, lilac, and 

 Viburnum. 



Distinguished from H. elongatum by the ascophores not 

 being aggregated on a black stain, and by the spores having 

 fewer septa, ends very obtuse, and not constricted at the 

 middle. 



** Spores 9-11-sejptate. 



Hysterographium elongatum. Corda, Icones., v. 

 p. 77, t. ix. fig. 62; Sacc, Syll., ii. n. 5759; Eehm, Krypt.- 

 Flora, Hyst., p. 19. 



Gregarious, seated on an effused blackish stain formed by 



