58 COLLEMACEI. [cOLLEMODIUM. 



brownish-green. Apothecia biatorine, small, gyalectiform, brown 

 or reddish, the margin thickish, entire ; spores ovoid, 3-4-septate 

 and sparingly longitudinally divided, 0,025-30 mm. long, 0011-12 

 mm. thick. Oollema biatorinum Nyl. Act. Linn. Soc. Bord. ser. 3, 

 i. (1857) p. 268; Carroll, Journ. Bot. 1866, p. 22; Cromb. Lich. 

 Brit. p. 5, Journ. Bot. 1874, p. 335 ; Leight. Lich. Fl. p. 21, ed. 3, 

 p. 25. Brit. Exs. : Larb. Lich. Hb. n. 282. 



Closely resembles Leptogium pusillum, from which it differs chiefly in 

 structure and the purely biatorine apothecia. Internally the thallus 

 presents scattered cavities, each containing 1 or 2 gonimic granules, 

 with traces of tubiform canals. The apothecia are scattered, or more 

 or less crowded. 



Hub. On cretaceous soil and the mortar of old walls in damp places in 

 maritime and upland tracts. Distr. The Channel Islands, S. and W. 

 Pmgland, plentiful where it occurs. B. M. : Coast of the island of 

 Alderney. Near Maidstone, Kent; near Lewes, Sussex; Reigate hill, 

 Surrey; Wadebridge, Cornwall; near Cirencester, Gloucestershire; 

 Charnwood Forest, Leicestershire. 



2. C. microphyllum Nyl. ex Lamy, Bull. Soc. Bot. Fr. t. xxx. 

 (1883) p. 3-37. Thallus effuse, microphylline, imbricato-lobcd, 

 often verrucoso-diffract, dark-green or olive-brown ; lobes minute, 

 ascending, granulato-crenate, somewhat dilated at the circumference. 

 Apothecia small, crowded, urceolato-concave, reddish-brown, the 

 thalline margin entire, tumid, subconcolorous ; spores ovoideo- 

 cllipsoid, usually 3-septate, becoming murali-locular, 0,016-24 mm. 

 long, 0,008-0,010 mm. thick. Cromb. Grevillea, xv. p. 12. 

 Leptogium microphyllum Nyl., Cromb. Journ. Bot. 1874, p. 330. 

 Collema microphyllum Ach. Lich. Univ. (1810) p. 630 ; Borr. Eng. 

 Bot. Suppl. t. 2721 ; Sm. Eng. Fl. v. p. 208 ; Mudd, Man. p. 41 ; 

 Cromb. Lich. Brit. p. 6 ; Leight. Lich. Fl. p. 22. Enchylium mi- 

 crophyllum Gray, Nat. Arr. i. p. 396. Leptogium fragrans Cromb. 

 Lich. Brit. p. 8 pro parte ; Leight. Lich. Fl. p. 30 pro parte, ed. 3, 

 p. 30. Collema fragrans Sm. Eng. Fl. v. p. 208. Enckyliumfragrans 

 Gray, Nat. Arr. i. p. 396. Lichen fragrans Eng. Bot. t. 1912. 

 Brit. Exs. : Leight. n. 258 ; Larb. Lich. Hb. n. 2. 



According to Nylander in litt. the gonimia are partly moniliform and 

 partly without order, with interwoven filamentose elements. From 

 Sowerby's original specimen it appears that Lichen fragrans E. B. is 

 merely a state of this, and the fragrance from which it obtained its trivial 

 name was, as observed by Borrer, accidental. The apothecia are minute, 

 numerous and crowded. 



Hab. On the trunks of old trees, chiefly Ash and Elm in shady upland 

 situations. Distr. In the Channel Islands, S.W. and N. England ; not 

 yet known from Scotland or Ireland. B. M. : St. Brelade's Bay, Island 

 of Jersey. Near Bury, Suffolk ; Copthall, Essex ; Southwick, near Lewes, 

 and Henfield, Sussex ; Lyndhurst, New Forest, Hants ; Wimpole Park, 

 Cambridgeshire ; Claines, Worcestershire ; near Oswestry, Shropshire ; 

 Garn, Denbighshire ; Ingleby Park, Cleveland, Yorkshire : Leven's Park, 

 Kendal, Westmoreland. 



