93 LICHENACEI. [STEXOCTBE. 



Stenocybe eusporum Mudd, Man, p. 256, t. iv, f. 103. Calidum 

 eusporum Cromb. Lich. Brit. p. 13. Calicmm septatum Leight. 

 Lich. Fl. p. 45, ed. 3, p. 45. Sphinctrina septata Leight. Ann. & 

 Mag. Xat. Hist. ser. 2, xix. (1857) p. 132, t. 8. fF. 20-24. The 

 specific name of Leighton, though having priority, is quite inappli- 

 cable in this genus. — Brit. Exs. : Mudd, n. 242 ; Leight. n. 228 ; 

 Cromb. n. 9. 



There has been considerable difhculty about this plant, owing to the 

 variable character of the spores, which, as already observed, has led to its 

 being confounded with the preceding. The thallus is so thin as to be 

 scarcely distinguishable from the bark upon which it gi-ows, and is usually 

 evanescent or none proper. The apothecia are generally numerous, some- 

 times 2-3 congregate, with the stipites varying in length from y\ to 

 I inch, and occasionally, when more elongate, becoming branched. 



Hab. On the bark of holly, and also parasitic on the thallus of Thelo- 

 trema lepadimnn and Graphis elegaiis in upland wooded districts. — Distr. 

 Local, though common where it occurs, in S. and N. England and in S. 

 and W. Ireland. B. M. : Near Lyndhurst, New Forest, Hants ; Ino-leby 

 Park and Bousdale Gill, Cleveland, Yorkshire. Gleubower Wood and 

 near Castlemartyi-, co. Cork ; Turc Mt., Killarney, co. Keriy ; Kylemore, 

 CO. Galway. 



3. S. byssacea Nyl. Bot. Xot. 1884, p. 84. — Thallus scarcely any 

 visible, or obscure and obsolete. Apothecia small, much scattered, 

 blackish; stipes very slender, sometimes branched; capitulum cla- 

 vato-tubiform : spores simple or at length l-3-8eptate, 0,015-23 mm. 

 long, 0,005-7 mm. thick ; paraphyses few ; hymenial gelatine 

 scarcely tinged with iodine. — Cromb. GrevT-Uea, xv. p. 14. — Calicmm 

 byssaceum Fr. Sched. Crit. i. (1824) p. 6 ; Cromb. Jouru. Bot. 1873, 

 p. 132 ; Leight. Lich. Fl. ed. 3, p. 45. 



Closely allied to the two preceding species, but smaller and more 

 slender, with the apothecia very much scattered and the spores smaller. 

 Unless after a shower of rain, it is scarcely visible, and is consequently 

 overlooked. The apothecia are frequently branched, becoming occasion- 

 ally somewhat fasciculate. 



Hab. On the truuks and branches of old alders in upland wooded 

 districts. — Distr. Local and scarce in W. England, N. Wales, and among 

 the Grampians, Scotland. — B. M. : Hay Park, Ludlow, Shropshire ; 

 Capel Curig, Carnarvonshire. Glen Lochay and Blair Athole, Perthshire ; 

 Glen Cluny, Braemar, Aberdeenshire. 



23. CONIOCYBE Ach. Yet. Ak. H. 1816, p. 288 ; Nyl. Mem. Soc. 

 Cherb. iii. (1855) p. 168. — Thallus effuse, leprose, thin, or scarcely 

 any distinct ; gonidial layer consisting of gonidimia, various in 

 form. Apothecia stipitate, globoso-pulverulent, yellow or pale, 

 stipes usually elongate : sporal mass copiously accumulated on the 

 capitulum ; spores spherical, simple, colourless, or pale-brownish, 

 mixed with the parajjhyses ; spermogonia with simplish sterigmata, 

 and oblong or ellipsoid spermatia. 



