COLLEMA.] 



41 



globose. Tlio apothccia arc freiifrally abundant, almost obliterating the 

 thallus, and becoming like it blackish when dry. The preceding species 

 is intermediate between this and C. chalazanum. 



Hah. Among mosses on old walls in shady places in upland districts. 

 — Distr. Very local, though plentiful where it occurs in W. England, 

 S. Wales, and N.E. Ireland, probably elsewhere overlooked. — J». M. : 

 Near Cirencester, Stroud, and Ablington, Gloucestershire; Pembroke- 

 shire. Near Belfast, co. Antrim. 



h. Hymeiiial gelatine bluish with iodine. 



4. C. confertum Nyl. Flora, 18G7, p. 330. — Thallus small, 

 turgidly s(iuamulosc, blackish-brown ; squamiiles crowded, usually 

 cyathoid or podetiiforra, almost all fertile. Apothecia small, urceo- 

 lato-impressed, one at the summit of each thalline squamule or 

 lobule, subconcolorous, the margin tumid ; spores ellipsoid or 

 fusiformi-ellipsoid, 0,017-23 mm. long, 0,008-10 mm. thick ; 

 paraphyses slender. — Leight. Ann. Mag. Nat. Hist. ser. 3, xx. 

 p. 259 ; Lich. Fl. p. 18, ed. 3, p. 16 ; Cromb. Lich. Brit. p. 4 ; 

 Journ. Bot. 1874, p. 333, — Collema turgidum var. confertum Ach. 

 L. U. (1810) p. 634. 



The peculiar squamulose thallus and the situation of the apothecia at 

 once distinguish tliis from other British species of Collema. It is allied 

 to C. lepideum Nyl., a West-African plant, and the two form a distinct 

 group, characterized by the thallus and the reaction of the hymenial 

 gelatine. No authentic British specimen has been found in recent years ; 

 and indeed the plant is known only from the original specimen sent by 

 Turner to Acharius, and from two fragments in Herb. Kew and Brit. 

 Mus. 



Hab. Amonast mosses on the ground in maritime tracts.— Z)/.s^?\ Known 

 only from E. England. — B. M. : Duuwich, Suffolk. 



'^^:^^ 



Fig. 11. 

 Collema pulposum Ach. 

 Six spores, 



X 500. 



EUCOLLEMA Cromb. Journ. Bot. 1874, 

 p. 333. — Thallus variously lobedj 

 rarely entirely granulose ; gonimic 

 granules usually moniliform. Apo- 

 thecia lecanorine ; spores septately 

 divided, irregularly murali - locular, 

 ovoid or ellipsoid ; hymenial gelatine 

 bluish with iodine ; spermogones with 

 jointed sterigmata. 



a. Thallus entirely granulose. 



5. C. terrulentum Nyl. Flora, 1874, 

 p. 306. — Thallus small, scattered, thin, 

 granulose, olive-brown or brownish-black. 

 Apothecia small, concave, reddish-brown, 

 the thalline margin thickish, entire; spores ellipsoid or oblong, 

 submr;rali-divided (usually with 5 transverse septa), 0, 018-24 mm. 



Fig. 12. 



Lollema mel<sniim Ach. 



Four spores, X 500. 



