ICMADOPHILUS | LECANORACEAR 5353 
Local though plentiful where it occurs in Great Britain and Ireland. 
—B. M. Ardingly, Sussex; Tunbridge Wells, Kent ; Bagshot Heath, 
Surrey; Island of Anglesea; Dent and Guisboro’ Moor, Cleveland, 
Yorkshire; Teesdale, Durham; Alston Moor, Cumberland; New 
Galloway, Kirkcudbrightshire ; Pentland Hills and Swanston Hill, 
near Edinburgh; Appin, Argyll; Blairdrummond near Stirling ; Glen 
Falloch, Craig Calliach, Ben Lawers and Killin, Perthshire ; Sidlaw 
Hills and Clova, Forfarshire ; Glen Callater and Morrone, Braemar, 
Aberdeenshire; Moidart, Rothiemurchus and Glen Nevis, Inverness- 
shire ; near Lairg, Sutherland ; Pass of Keimaneigh and Gouganebarra, 
Cork ; Dunkerron and Killarney, Kerry ; Connemara, Galway; Slieve 
More, Achill, Mayo. 
55. HAMATOMMA Massal. Ric. Lich. Crost. p. 32 (1852) ; 
Mudd Man. p. 157. (PI. 55.) 
Thallus crustaceous, corticate on the upper surface or non- 
corticate. Algal cells Protococcus. Apothecia sessile or some- 
times immersed ; paraphyses discrete, slender; spores 8 in the 
ascus, narrowly elongate, straight, bent or sometimes partly 
coiled, 3—many-septate, colourless. Spermogones with simple or 
branched sterigmata and arcuate acrogenous spermatia. 
1. H. ventosum Massal. Ric. Lich. Crost. p. 33 (1852),— 
Thallus determinate, thick, firm, crowdedly and _ irregularly 
warted, cracked-areolate, greenish-yellow or dark greenish-grey 
(K + yellow). Apothecia sessile, small, moderate in size, or 
rather large and often irregular (up to 3 mm. across), the disc 
plane or convex, dark-crimson or blood-red (K + blue-purplish), 
the thalline margin thin, often excluded ; paraphyses discrete, 
stoutish, septate, scarcely widened upwards; spores irregularly 
elongate-fusiform, somewhat curved or contorted, 3—7-septate, 
40-55 » long, up to 5p thick; hymenial gelatine blue with 
iodine.—Mudd Man. p. 157, t. 2, fig. 52. Lichenoides tartareum 
lividum, scutellis rufis, margine ewili Dill. Hist. Muse. p. 133, 
t. 18, fig. 14 (1741). Lichen ventosus L. Sp. Pl. p. 1141 (1753) ; 
Lightf. Fl. Scot. ii. p. 806; Huds. Fl. Angl. ed. 2, p. 527; 
Engl. Bot. t. 906 ; With. Arr. ed. 3, iv. p. 16. L. gelidus Huds. 
tom. cit. p. 528 (1778) (non Linn.). Lecanora ventosa Ach. 
Lich. Univ. p. 399 (1810); Hook. Fl. Scot. ii. p. 48 & in Sm. 
Engl. Fl. v. p. 189; Grev. Fl. Edin. p. 332; Tayl. in Mackay 
Fl. Hib. ii. p. 136 ; Cromb. Lich. Brit. p. 57 (incl. var. subfestiva) 
& Monogr. i. p. 456 (incl. var. subfestiva) ; Leight. Lich. Fl. 
p. 233; ed. 3, p. 225. Rinodina ventosa S. F. Gray Nat. Arr. i. 
p. 451 (1821). 
Ezsice. Bohl. n. 36; Croall n. 588; Dicks. Hort. Sicc. fasc. 
v.n. 23; Leight. n. 9; Mudd n. 29. 
Distinguished from other species by the thicker non-leprose 
thallus and by the generally darker apothecia, the deep colour of 
which tinges the covering paper in herbaria. When very dark they 
have been referred to var. lepadolemma (Parmelia ventosa var. lepa- 
Ie 2A 
