BRITISH HEPATIC^. 39 



Tkichocolea tomentblla, Dwmort. 



Pl. X. Pig. 32. 



Jungermannia tomentella, Ehrh. Beitr. Band ii. p. 150 (1793) ; Dicks. PI. Oryp. 

 Fasc. ii. p. 14 ; Eng. Bot. t. 2242 ; Hook. Jung. t. xxxvi. ; Muse. Brit. ed. ii. p. 237, 

 n. 65 ; Mackay, PI. Hibern. ii. p. 66, n. 67 j PI. Danica, t. 2193, c. fr. j Gray's Nat. 

 Arr. i. p. 703. 



Jvmg. ciliaris, Weis. PI. Cryp. p. 189 ; "Weber, Spic. PI. Gott. p. 150 j Huds. PI. 

 Ang. p. 515 ; Lamarck, Enc. Bot. p. 284 ; With. Arr. p. 861. 



Tricholea, Dum. Com. p. ILS; Syll. Jung. p. 66, t. i. f, 8; Obs. des Jung, 

 p. 20. 



Trichocoka, N. ab E. Leberm. Eur. iii. p. 105 ; N. ab E. L. & G. Syn. Hep. p. 237 ; 

 Jensen, Cons. Hep. Dan. p. 113 ; Horn. PI. (Econ. ii. p. 467 ; Hartm. Scand. PI. ix. 

 ed. ii. p. 147 j G. & E. Hep. Eur, Ex. n. 32, 272, c. icon. ; Moug. et Nestl. PI. Or. 

 Vog. Ehen. I. n. 52. 



Musciis palustris absinthii/olio insipidis, Tourn. H. Par. p. 505 ; Yaill. Bot. Par. 

 p. 141, t. 26, f. 11. 



Liclienastrvm, fMcinum pulchrum villosum, Dill. Muse. t. Ixxiii. A. B. 



Hab. Plentiful on moist rocks, under tbe shado-w of trees, in many parts of 

 Britain, but rarely fertile : — Bishop's Castle, Salop, and Dorking, Surrey, Billenius, 

 1741. Allen's Pord, Durham, Mr. Thornhill Stock Gill, Ambleside, young fr. 

 15 Aug. 1813, a Lyell! Cotterell Clough, Cheshire, fr. 8 Nov. 1821, and Aber 

 Eiver, North "Wales, ^, W, Wilson ! Devon, fr. Sir W. Hooker ! Loch Tay, Dr. 

 Greville 1 Barmouth ! Bolton woods ! "Woods of Cawder, Porfar, 1844, .4. Groall ! 

 Glen Cluny. 



Fronds pinnate-decompound, forming dense tufts, sometimes 

 several feet in diameter, conspicuous from the very pale glaucous- 

 green colour, and tomentose habit. 



Stems (f. 32, 1) from 2" to 6" in height, and about -^" in diameter, 

 erect, flexuose, primary branches stouter, furcate ; secondary ramuli 

 alternately pinnate, patent, more or less crowded, often beset with 

 shorter pinnules. TJltimate shoots cylindrical, of nearly equal 

 diameter throughout (-^0'')' ^^^ geniculate rachis being hidden by 

 the closely-imbricated multifid leaves, resembliiig the ramification 

 of Ceratophyllvm, or Batrachospermum. Apex of the principal 

 shoots thickened and sub-falcate, from the crowding together of 

 undeveloped branches. 



Texture of the stems loosely cellular, the cortical layer com- 

 posed of columnar elongated cells, so as to appear fluted, as in 

 Gallithamnion ; colour pale green, brownish near the base. In a 

 dry state the stems shrink, and the lower part appears fistulose 

 (as described by Dillenius), from the shrinking of the intermediate 

 cslls 



kootlets scanty, a few pellucid fibres arising from the bases of 

 amphigastria, near the inferior portions of the shoots. 



Leaves (f. 32, 2) of nearly uniform size, -io", patent, inflexed at 

 the apex, and, in the words of Hooker, " scarcely larger on the main 

 part of the stem than on the secondary branches ; thus appearing 



