SYNALISSA.] 



COLLEMEI. 



3'; 



lular. Apotbccia terminal, innate, lecanorino-endoearpoid, conco- 

 lorous; spores ellipsoid or ovoid, 

 usually Snx, occasionally nu- 

 merous, simple, colourless ; hy- 

 menial gelatine variously tinged 

 with iodine. Spermogoncs ter- 

 minal or subterminal, with 

 simplish sterigmata and oblong 

 spermatia. 



Distinguished from Ompha- 

 laria, which does not occur in our 

 islands, chiefly by the gonimic 

 giMUides ; these are in pairs 

 between the thaUine iilaments or 

 affixed to their brauchlets. Only 

 two species occur with us, rarely, 

 and generally in poor condition. 



1. S. symphorea Xvl. Syn. 

 i. (1858) p. 9i, t. 3.' f. 2.— 

 Thallus fruticulose, fiistigiately 

 divided, opaque,black ; branches 

 short, rounded, erect, obtuse at 

 the apices, sometimes onl}- no- 

 dulose. Apothecia minute, 

 punctiformi - impressed, at 



Fl<r. 8. 



length dilated, subconcolorous, Synalism symphorea 2Syl. — a. Section of 



thallus with an apotheeium, X 30. 

 h. Section of a spennogone. X 30. 

 c. Syngonimia between the filaments, 

 X 350. d. Gonimia affixed to a race- 

 mosely divided filament. X 350. e. Spo- 

 riferoiis theca with three paraphyses, 

 X 350. /. Four spores, x 500. g. 

 Sterigmata and spermatia, X 500. 



the thalline margin tumid ; 



spores 8-24nae, ellipsoid or 



spherical, 0,009-11 mm. long, 



0,006-7 mm. thick ; hymenial 



gelatine not tinged with iodine. 



— Mudd, Man. p. 35, t. 1. 



f. 2 : Cromb. Lich. Brit. p. 3 ; 



Leight. Lich. Fl. p. 16, ed. 3, p. 13. — Sijnalissa vulgaris Thwaites, 



Ann. Mag. Xat. Hist. 1849, iii. p. 219. Collema syrapluirewn DC. FL 



Fr, ii. (1805) p. 382. C. synalissa Ach., Tayl. in Mack. Fl. Hib. ii. 



p. 108. 



The thallus in our specimens is generally only noduliform. Elsewhere 

 it often occurs amongst the squamules of Lecidea lurida, and fiirther 

 research may discover it in Britaui also similarly associated. A reference 

 to fig. 8 will show the peculiar arrangement of the gouimia alHxed to 

 the branchlets of the iilaments. The apothecia are very rare in Great 

 Britain, and the spermogones are onlv seldom seen, with spermatia 

 0,003 mm. long, 0,001 mm. thick. 



Hab. On calcareous rocks in maritime and upland districts. — Disir. 

 Local and rare, having with certainty been gathered only very sparingly 

 in S.W. England, and in the S. W. Highlands, Scotland ; the Irish plant 

 being very doubthd. — B. M. : Portland Island, Dorsetshu'e ; Anstey's 

 Cove, Torquay, Devonshire ; 8t. Vincent's rocks, Gloucestershire. Bar- 

 caldine, Argyleshire. 



