PHLYCTIS | THELOTREMACEX 381 
with an apiculus at each end 35-80 yw long, 11-32 » thick.— 
Mudd Man. p. 279, t. 5, fig. 118; Cromb. Lich. Brit. p. 61 & 
Monogr. i. p. 512; Leight. Lich. Fl. p. 246; ed. 3, p. 237. 
Lichen agelzeus Ach. Lich. Suec. Prodr. p. 30 (1798) ; Engl. Bot. 
t. 1730. Thelotrema agelea 8S. F. Gray Nat. Arr. i. p. 494 
(1821) pro parte. Variolaria agelea Turn. & Borr. ex Hook. 
in Sm. Engl. Fl. v. p. 171 (1833) & Lich. Brit. p. 78. V. con- 
stellata Tayl. in Mackay Fl. Hib. ii. p. 113 (1836) pro parte. 
Exsicc. Leight. n. 282 ; Mudd n. 269. 
The thallus is thin and often spreads widely over the bark. 
Apothecia are generally numerous and become dark with age, though 
for the most part covered over by the leprose thallus. This species 
and the following have recently been reported from Perthshire by 
Wheldon and Wilson (Journ. Bot. 1915, Suppl. p. 45). 
Hab. On trunks of trees in maritime and inland situations.— 
Distr. Fairly common throughout England, rare in S. Ireland and 
Seotland.—B. M. Arton near Totnes and Ilsham Walk, Torquay, 
Devon ; Carisbrooke, I. of Wight; New Forest, Hants ; near Lindfield, 
Glynde and Henfield, Sussex; Shiere, Surrey; Penshurst, Kent ; 
Epping Forest, Quendon, Rickling, Hadleigh Woods and Stansted 
Mountfitchet, Essex; Bathampton Downs, Somerset; Cirencester, 
Gloucestershire; Forden, Montgomeryshire; Huglith, near Church 
Stretton and Oswestry, Shropshire; Barmouth and Aberdovey, 
Merioneth; Harboro’ Magna, Warwickshire; Airyholm Wood and 
Hoggart’s Wood, Cleveland, Yorkshire; Kitsboro’, Riverstone and 
Castlebernard Park, Cork; Askew Wood and Dunkerron, Killarney, 
Kerry. 
2. Phi. argena Koerb. Syst. Lich. Germ. p. 391 (1855).— 
Thallus effuse, thin, smooth or wrinkled, pulverulent, silvery- 
grey or cream-coloured (K + yellow then deep red). Apothecia 
small, the disc blackish and pruinose ; spores | in the ascus, 
oblong-ellipsoid, not apiculate, very large, 100-140 y» long, 
27-50 p thick.—Mudd Man. p. 280 ; Cromb. Lich. Brit. p. 61 & 
Monogr. i. p. 513; Leight. Lich. Fl. p. 246; ed. 3, p. 237 
Lichen argenus Ach. Lich. Suec. Prodr p. 8 (1798) ; Engl. Bot. 
t. 1923. Variolaria argena Turn. & Borr. ex Hook. in Sm. 
Engl. Fl. v. p. 171 (1833) & Lich. Brit. p. 75. 
Differs from the preceding in-the somewhat thinner more pul- 
verulent thallus, and in the non-apiculate spores. Fruiting specimens 
are not common. ; 
Hab. On the trunks of old trees in upland districts.—Distr. Rather 
rare in 8.W. and Central England.—B. M. Beckey Falls, Devon; 
New Forest, Hants; Shiere and Haslemere, Surrey ; Ightham, Kent; 
Epping Forest, Gosfield Hall and Stansted Mountfitchet, Essex; 
Burnham Beeches, Bucks; Charnwood Forest and Gopsall Wood, 
Leicestershire ; Broadwas and near Worcester ; Barmouth, Merioneth ; 
Oswestry, Shropshire. 
60. DIPLOSCHISTES Norm. in Nyt. Mag. Nat. Vidensk. vii. 
p. 232 (1853). Urceolaria Ach. Meth. Lich. p. 141 (1803) pro 
parte (non Willd.) ; 8. F. Gray. Nat. Arr. i. p. 457 pro parte; 
