BILIMBIA] LECIDEACEiE 137 



•colourless or brownish ; paraphyses coherent, dark-brown or 

 greenish-blue at the clavate apices ; spores cylindrical or fusiform- 

 cylindrical, simple or 3-septate, 0,018-36 mm. long, 0,004-5 mm. 

 thick ; hymenial gelatine bluish then wine-red with iodine. — 

 Lichen squalidus Schleicher in Schrad. Neu. Journ. Bot. i. 2, p. 199 

 .(1806) nomen. Lecidea squalida Ach. Lich. Univ. p. 169 (1810) ; 

 •Cromb. in Journ. Bot. xi. p. 136 (1873) ; Leight. Lich. Fl. ed. 3, 

 p. 358. 



The thallus varies in thickness and sometimes occurs in small 

 -orbicular patches ; the apothecia are numerous and become subglobose 

 and conglomerate. 



Hab. On mosses chiefly Andreaeas, and on calcareous soil in 

 mountainous regions. — Distr. Rare on the Grampians, Scotland. — 

 B. M. Above Loch-na-gat, Ben Lawers, Perthshire ; Craig Guie, 

 Braemar, Aberdeenshire ; Barcaldine, Argyll. 



8. B. Candida A. L. Sm. — Thallus glaucous-white, tartareous, 

 warted-areolate, turgid, sublobate (K — , CaCl — ). Apothecia 

 minute, solitary or confluent, sessile, black, plane or convex, 

 marginate ; hypothecium thick, black ; spores linear-cylindrical 

 or fusiform, 3-septate sometimes 2- or 4-septate, 0,015-16 mm. 

 long, 0,0035 mm. thick. — Lichen candidus Sm. Engl. Bot. t. 1138 

 <1803). Lecidea Turneri Leight. Lich. Fl. p. 330 (1871) ; ed. 3, 

 p. 353. 



I have examined the specimen of Lichen candidus in the Sowerby 

 herbarium, said by Leighton to be S3aionymous with his L. Turneri, 

 and have been unable to find spores ; the hypothecium is thick and 

 dark, becoming a greenish-brown colour in the hymenium ; the 

 paraphyses are slender and closely coherent. There is no other 

 specimen in the British Museum. 



Hab. On mortar in walls, etc. — Distr. S. and central England. — 

 B. M. Near Yarmouth, Norfolk. 



9. B. sphseroides Koerb. Syst. Lich. Germ. p. 213 (1855) 

 €xcl. syn. — Thallus effuse, granulose-subpulverulent, greyish- or 

 greenish-white (K - , CaCl — ). Apothecia moderate, sessile, pale- 

 yellow, at first plane with thickish, paler margin, at length 

 convex, subglobose, immarginate ; paraphyses concrete, colourless 

 or very pale-yellowish ; hypothecium pale ; spores oblong-fusiform, 

 3-septate, 0,015-21 mm. long, 0,005—7 mm. thick; hymenial 

 gelatine pale-bluish then deep wine-red with iodine. — Lichen 

 ■sphseroides Dicks. Crypt, fasc. i. p. 9, t. 2, f. 2 (1785) ; With. 

 Arr, ed. 3, iv. p. 15. Lecidea sphseroides Sommerf. Suppl. Fl. 

 Lapp. p. 164 (1826); S. F. Gray Nat. Arr. i. p. 474; Cromb. 

 Lich. Brit. p. 70 ; Leight. Lich. Fl. p. 336 ; ed. 3, p. 357. 



There is a wide variation in the form and septation of the spores, 

 from short, 1 -septate and almost pyriform to oblong, narrowly fusi- 

 form and S-septate. 



Hab. On trees, on mosses on trees, and on the ground. — Distr. 

 Rare throughout the British Isles. — B. M. St. Minver, Cornwall ; 



