BRITISH LICHENS

170 CYCLOCARPINElE BACIDIA
f. inundata Cromb. Lich. Brit. 73 (1870). L. effusa var. inundata
Leight. Lich. Fl. 344 (1871); ed. 3, 371.
Exsicc. Mudd n. 149.
The thallus, occasionally little developed, varies somewhat in
thickness, and when dry is often tawny-greenish. It is usually well
fertile; the apothecia are very variable in colour in dIfferent specimens;
the spores are often curved to an S-shape. The spermogones
are frequent with curved spermatia, 2·5--3 (.I. long, ·6 (.I. thick.
Hab. On rocks and boulders, at times inundated, in maritime and
upland tracts, also on moist wood.-Distr. Seen only from a few
localities in Great Britain and Ireland; no doubt often overlookcd.­
B. M. Malpas, near Truro, and Mt. Edgecumbe, Cornwall; Fishguard
Harbour, Pembrokeshire; near Ayton and Airyholme Wood, Cleveland,
Yorkshire; Teesdale, Durham; near Hexham, Northumberland;
ncar Ballachulish, Argyll; Glen Lochay, KIllin, Perthshire; Glen
Callater, Braemar, Aberdcenshire; Killery Bay and Lettermore,
Connemara, Galway.
Subsp. allecta A. L. Sm.-Apothecia white-flesh-coloured;
spores acicular, thin, 56-70 (.I. long, 1 (J. thick; otherwise as in
the species.-Lecidea inundata subsp. allecta Ny!. in Flora Ix. 567
(1877); Cromb. in Journ. Bot. xx. 275 (1882) & in Grevillea xxii.
58. Specimen not seen.
Characterized by the paler colour of the apothccia and the thinner,
longer acicular spores. Spermatia as in the species.
Hab. On siliceous rocks in a maritime district.-Distr. Local and
scarce in W. Ireland (Kylemore, Galway).
(b) Apothecia dark-coloured.
17. B. caligans A. L. Sm.-Thallus indeterminate, thinnish,
rugose, deeply cracked, fuliginous-black (K -, CaCI). Apothecia
small, plane, obtusely margined, blackish; hypothecium colourless
(the perithecium somewhat brownish above); paraphyses
concrete, colourless at the apices; spores thinly acicular, indistinctly
septate, 30-35 (.I. long, 1·5 (.I. thick; hymenial gelatine
wine-reddish with iodine.-Lecidea caligans Ny!. in Flora lvii.
10 (1874); Cromb. in Gr,evillea ii. 140 & xxii. 58; Leight. Lich.
ed. 3, 283, 371.
Closely resemblmg B. inundata. The dark colour of the thallus
is due to the' presence of blue-green algae.
Hab. On rocks in a maritime district.-B. M. Island of Alderney
(the only locality.)
18. B. egenula Th. Fr. Lich. Scand. 363 (1874}.-Thallus
very thinly granulose, greyish (Kf + yellowish), nearly obsolete.
Apothecia small, plane, obtusely margined, at first brown then
blackish or dark-brown, the margin thickish, at length evanescent;
hypothecium brownish; paraphyses loosely coherent, clavatecapitate
and colourless at the apices, the epithecium brown;