PHYSCIA | PHYSIACEE 241 
zontal or ascending straggling lacinix, beset with marginal grey 
or brownish cilia, generally pale-grey, becoming darker, whitish 
beneath, with few grey rhizine (K + Yewsb), Apothecia small 
or moderate in size, the disc pruinose or naked, the margin 
entire, sometimes becoming crenulate ; spores oblong, 15-23 py 
long, 8-11 » thick.—Ph. stellaris var. tenella Nyl. in Mém. Soc. 
Sci. Nat. Cherb. v. p. 107 (1857) ; Cromb. Lich. Brit. p. 39 ; 
Leight. Lich. Fl. p. 151; ed. 3, p. 141; var. leptalea Nyl. Syn. 
Lich. p. 425 (1860); Cromb. Lich. Brit. p. 39 & Monogr. i. 
p- 311; Leight. Lich. Fl. p. 151; ed. 3, p. 140; subsp. tenella 
Nyl. ex Cromb. in Grevillea xv. p. 78 (1887) & Monogr. i. 
p. 312. Muscus parvus cinereus marginibus pilosis Buddle Hort. 
Sice. il. fol. 6, n. 7 in Herb. Sloane. Lichenoides hispidum minus 
et tenerrius, scutellis nigris Dill. Hist. Muse, p. 152, t. 20, f. 46 
(1741). Lichen hispidus Schreb. Spic. Fl. Lips. p. 126 (1771). 
L. tenellus Scop. Fl. Carn. ed. 2, ii. p. 394 (1772); With. Arr. 
ed. 3, iv. p. 56; Engl. Bot. t. 1351. JL. ciliaris var. Lightf. 
Wie Scot. ii. p. 828 (1777); Huds. Fl. Angl. ed. 2, p. 538. 
L. leptaleus Ach. Lich. Suec. Prodr. p. 108 (1798). Parmelia 
tenella Ach. Meth. Lich. p. 250 (1803); Tayl. in Mackay FI. 
Hib. ii. p. 147. Borrera tenella Ach. Lich. Univ. p. 498 (1810) ; 
S. F. Gray Nat. Arr. i. p. 434; Hook. Fl. Scot. ii. p. 56 & in 
Sm. Engl. Fl. v. p. 222. B. hispida Mudd Man. p. 106 (1861) 
(incl. var. tenella). 
Exsicc. Bohl. 1. 20; Carroll Lich. Hib. n. 8; Cromb. n. 151; 
Johns. n. 92; Larb. Lich. Hb. n. 330; Leight. n. 174; Mudd ° 
n. 78. 
Somewhat similar in habit and appearance to Ph. ciliaris, but of 
slighter structure throughout. The two plants, Lichen tenellus 
and L. leptaleus, now united under Ph. hispida, do not differ except 
in the hooded tips, frequently sorediate, of the laciniz in subsp. tenella. 
These are caused by a mite which eats away the cortex and stimulates 
a formation of gonidial tissue (Bouly de Lesdain, Lich. Dunk. p. 68). 
The upper cortex is plectenchymatous and densely granulose; the 
lower cortex is fibrous with here and there rhizinw; the lacinie are 
mainly attached by the cilia. 
Hab. On trees, rarely on oid walls or boulders in maritime and 
inland districts.—Distr. Common throughout the British Isles.— 
B.M. La Moye, Jersey; Guernsey; Penzance, Withiel and St. Minver, 
Cornwall; Bolt Head and Plymouth, Devon; Lymington, Hants; 
Shanklin and Brading, I. of Wight; St. Leonards Forest, Wolstonbury, 
Bolney and Hurstpierpoint, Sussex; Holmwood, Surrey; Ulting and 
Walthamstow, Essex ; near Cirencester, Gloucestershire ; Twycross and 
Bardon Hill, Leicestershire; Grimsbury Green, Northamptonshire ; 
Malvern, Worcestershire; Llanymynech and Oswestry, Shropshire ; 
Tenby, Pembrokeshire; Aberdovey and Dolgelly, Merioneth; Angle- 
sea; Bury St. Edmunds, Suffolk; Eaton and Earsham, Norfolk ; 
Buxton, Matlock, Darley, Eyam and Cromford, Derbyshire; Ayton, 
Stokesley and Kildale, Cleveland, Yorkshire; Gainsford, Durham; 
Holy Island, Northumberland; Croft Head, Westmoreland; near 
Asby, Cumberland; New Galloway, Kirkeudbrightshire; Swanston 
E R 
