60 COLT/EMACEI. [LEFTOGIUM. 



the S.W. and Central Highlands of Scotland, and S.W. Ireland. B. M. : 

 The Grove, Island of Jersey. Near Hale End, Epping Forest, Essex ; 

 Shiere, Surrey; Folkestone* Kent ; West Downs and Henfield, Sussex; 

 Shanklin, Luccombe, and Bonchurch. Me of Wight ; near Withiel, Corn- 

 wall ; Clevedon, Somersetshire ; near Wootton-under-Edge, Gloucester- 

 shire ; Colwall, Herefordshire ; near Ayton, Cleveland, Yorkshire. 

 Island of Lismore, Argyleshire; Clova, Forfarshire. Dunkerron, co. 

 Kerry. 



6. L. amphinenm Nyl. Lich. Scand. (1861) p. 32. Thallus ad- 

 nate, very thin, or subcrustaceous, unequal, olive or brownish-green. 

 Apothecia small, concave, dark-reddish, the margin thickish ; spores 

 ellipsoid or ellipsoideo-ovoid, 3-septate and variously divided, 

 0,023-27 mm. long, 0,009-0,011 mm. thick. Cromb. Journ. Bot. 

 1874, p. 133; Leight. Lich. Fl. ed. 3, p. 29. Collema amphineum 

 Ach. ex Nyl. 1. c. 



Differs from L. humosum in the more continuous and eqiial thallus, 

 and in the structure of the spores, and from L. subtile, of which it seems 

 a subspecies (Grevillea, xv. p. 12), in the more crustaceous thallus and 

 larger spores. The plant spreads thinly over the substratum, and with 

 us is sparingly fertile. 



Hob. On the ground, rarely on roots of old trees, in shady places in 

 maritime and upland tracts. Distr. Foimd only sparingly in S. and W. 

 England. B. M. : Henfield, Sussex ; Newlyn Cliff, Penzance, Cornwall ; 

 Stroud, Gloucestershire ; Newbury, Worcestershire. 



7. L. minutissimuiu Fr. Sum. Veg. (1846) p. 122; Kb'erb. Par. 

 (1865) p. 423. Thallus thinly membranaceous, minutely lobed, 

 smooth, olive-green or leaden-brown ; lobes imbricate, inciso-crenate 

 at the margins. Apothecia minute, concave, reddish-brown, the 

 margin thin, entire, or sometimes at length subcrenulate ; spores 

 oblongo-ovoid, irregularly murali-locular, large, 0,024-0,030 mm. 

 long, 0,009-0,015 mm. thick. Collema minutissimum Florke, 

 Deutsch. Lich. (1815) n. 99. Leptoc/ium lacerum var. crenatum 

 Nyl., ex Carroll, Journ. Bot. 1866, p. 22. Leptogium subtile f. lati- 

 usculum Nyl. ex Josh. Grevillea, iv. p. 43 ; Leight. Lich. Fl. ed. 3> 

 p. 29. Leptogium sinuatvm var. crenulatum Cromb. Journ. Bot. 

 1874, p. 336 ; Leight. Lich. Fl. ed. 3, p. 40. Leptogium frayrans 

 Mudd, Man. p. 46 ; Leight. Lich. Fl. p. 30, pro parte. Collema fra- 



Mack. Fl. Hib. ii. p. 107. Brit. Exs.: Cromb. n. 107. 



This species, little understood by British authors, looks like a diminu- 

 tive state of L. lacerum, though at once separated by the texture of the 

 thallus. From the closely allied L. subtile it is distinguished by the 

 more developed thallus and the larger spores. The apothecia, which are 

 numerous and crowded, are gyalectiform and superficial. 



Hob. On the ground, rarely on trunks of old trees, in upland districts. 

 Distr. Local and rather scarce in S., W., and N. England, rare in S. 

 Ireland. B. M. : Halstead, Kent ; Butler's Holt, Buckinghamshire ; near 

 Cirencester, Gloucestershire ; near Ayton, Cleveland, Yorkshire. Bantry, 

 co. Cork. 



