CONIOCYBE.] CALICIEI. 101 



4. C. hyalineUa Nyl. Mem. Soc. Cherb. v. (1857) p. 93 ; fyn. 

 i. p. 164, t. v. f. 40. Thallus obsolete. Apothecia small ; stipes 

 slender, hyaline, brownish above ; capitulum globose ; sporal mass 

 white or 'pale- reddish: spores minute, 0,0025-0,004 mm. in dia- 

 meter. Cromb. Lich. Brit. p. 14 ; Leight. Lich. Fl. p. 47, ed. 3, 

 p. 46. 



Occasionally there are traces of a very thin, whitish, and leprose thalhis, 

 hut it is doubtful if this be proper. It is closely allied to C. pallida, but 

 differs in the more slender stipes, and in the spores being at least half 

 the size. 



Hah. On indurated stumps of trees in wooded upland districts. 

 Distr. Found only very sparingly in N. England. B. M. : Brantedale, 

 Yorkshire. 



24. TRACHYLIA Fr. Yet. Ak. 



Handl. 1821, p. 324, pro parte ; Nyl. 

 Mem. Soc. Cherb. iii. (1855) p. 167; 

 Lich. Scand. p. 44 (note). Thallus 

 granulose, or rarely subleprose, or 

 wanting. Apothecia sessile, cupu- 

 liform, open, black, with thin pro- 

 per margin ; sporal mass more or 

 less accumulated, black ; spores 1- 

 septate, rarely pluri-septate and 

 irregularly divided, ellipsoid, black- 

 ish or brownish-black : hymenial 

 gelatine scanty and scarcely tinged 

 with iodine. Spermogones with ob- 

 long or ellipsoid spermatia. 



Distinguished from the allied genera 

 by the apothecia being constantly 

 sessile, almost lecideiform, and the 

 ellipsoid spores. As already noted 

 under Calicinm retinens, transition 

 forms are not wanting, and Trackylia 

 may not be generically distinct. The 

 gonidia are globulose. 



x 3Q b Theca (wth 



8pO res) and a paraphysis, X 3oO. 

 c Older (free) spores, X 500. 

 d. Vertical section of a spermo- 

 gonium, x 'M. e. Steriguiata 

 and spermatia, 500. 



1. T. tigillaris Fr. Sum. Yeg. (1846) p. 282. Thallus effuse, 

 granulose, or granulato-areolate, or concrescent, usually riinose, 

 yellowish-green or citrine (K ). Apothecia small, plane, innate, 

 black, the margin prominent, at length excluded ; spores 1 -septate, 

 0,015-25 mm. long, 0,008-11 mm. thick. Cromb. Lich. Brit. p. 14; 

 Leight. Lich. Fl. p. 48, ed. 3, p. 47. Acolium tiyillare Gray, Xat. 

 Arr. i. p. 482 ; Mudd, Man. p. 254. Calicium tigillare Turn. & 

 Borr. Lich.Br. p. 132; Sm. Eng. Fl. v. p. 139. Lichen tigiUaris 

 Ach. Prodr. (1798) p. 67 ; Eng. Bot. t. 1530. 



There is a striking contrast between the colour of the thallus and of 



