42 COLLEMACEI. [COLLEMA. 



long, 0,010-12 mm. thick. Cromb. GreviUea, iii. p. 22; Journ. 

 Bot. 1874, pp. 140, 333 ; Leight. Lich. Fl. ed. 3, p. 25. 



This rather inconspicuous plant is characterized by the apparently 

 constantly orauulose thallus. The only specimen gathered occurred in 

 small scattered pulvinuli, most of which were infertile. The nature of 

 the thallus and the form of the spores separate it from Leptorjium mu.ro- 

 phyllum, to which it bears a general resemblance. The apothecia are at 

 first somewhat urceolate. 



Hab On the bark of an old ash-tree in a wooded upland district. 

 Distr. Known only from the S.W. Highlands, Scotland. B. M. : Shores 

 of Loch Katrine, Perthshire. 



b. Thallus acervulato-aggregate or pulvinato-congested. 



6. C. ceraniscum Nyl. Flora, 1865, p. 353. Thallus small, 

 cjespitose, smooth, opaque, pulvinato-congested, laciniato-divided, 

 dark olive-greenish or olive-brown, divisions subrotundato -com- 

 pressed, ceranoideo-dissected, somewhat obtuse and nodulose at the 

 apices, erect or ascending. Apothecia small, somewhat concave, 

 brownish-black, the thalline margin thin, smoothish ; spores (4-) 

 8nae, ellipsoid, rounded at both apices, 2-6 transversely seriate and 

 loculose, 0,027-34 mm. long, 0,018-21 mm. thick; paraphyses 

 slender ; hy menial gelatine bluish (the thecae more intensely so) 

 with iodine. Carroll, Journ. Bot. 1865, p. 287 ; Cromb. Lich. Brit. 

 p. 6 ; Journ. Bot. 1874, pp. 140, 333 ; Leight. Lich. Fl. p. 24, ed. 3, 

 p. 17. Collema ceranoides Mudd (non Borr.), Man. p. 4, pro parte. 



This very distinct species (of which Nylander has given me the above 

 amended diagnosis) has the appearance of a larger condition of Synalissa 

 symphorea. The thallus, which forms small pulviuuli, is often pale olive 

 at the base, and has the gonimia moniliform. The apothecia, which are 

 subconcolorous with the thallus, are not at all numerous in the specimens 

 seen. " The character of the thallus with its crowded nodulose dark apices, 

 and the form of the spores which are internally as if grossly botryoso- 

 granulose, prevent this species being confounded with any other " (Nyl. 

 in lift.). 



Hab. On damp shaded rocks among small mosses in alpine places. 

 ' J \ Found only very sparingly among the S. Grampians, Scotland. 

 M. : Summits of Ben Lawers and Craig Calliach, Perthshire. 



Distr. 

 B. M 



c. Thallus macrophylline, variously lobed. 



7. C. auriculatnm Hoffm. Deutsch.Fl. ii. (1795) p. 98. Thallus 

 dilated, slightly rigid, roundly lobed, more or less granulate, opaque, 

 sordid glaucous-green or olive-brown ; lobes irregularly repando- 

 crenate, transversely rugulose (I -f blood-red). Apothecia moderate, 

 scattered, concave, at length nearly plane, reddish-brown, the margin 

 thick, entire ; spores ovoid or ellipsoid, 3-septate, with a few longi- 

 tudinal septa, 0,022-27 mm. long, 0,011-15 mm. thick. Cromb. 

 Journ. Bot. 1870, p. 96 ; Leight. Lich. Fl. p. 21, ed. 3, p. 17. To 

 this belongs Collema dermatinum Borr. Eng. Bot. Suppl. t. 2716. 

 f. 2 (lower fig.). Var. membranacea Kremp., Cromb. Journ. Bot, 



