BRITISH LICHENS

APPENDIX TO PART I
TUE genera and species described below are emendations or
addItions to Part I (published in 1918). Their place in the text
is indicated.
Family I. CALICIACElE.
After Stenocybe byssacea, p. 20, add :-
Stenocybe bryophila Wats. in Journ. Bot. lxiii. 130 (1925).­
Thallus little evident, obsolete or none proper. Apothecia
stalked, 1-1·5 mm. long, dark or greyish, often with a bluish
tinge, somewhat shining, especIally at margin of disc'; capitulum
clavate-truncate, with the margin of the disc inflexed; paraphyses
not very evident, sometimes showing as more or less entangled
hyaline filaments; ascus cylindrical, about 350 tJ. long, 25 tJ. wide,
narrowed at base, bluish with iodine; spores 8 in the ascus, darkbrown,
obliquely I-seriate, 3-septate with paler and smaller endcells,
35-40 tJ.long, 12-15 tJ. thick; asci and paraphyses bluish with
iodine.
IIab. On stems of Hepatics on rocks or trees.-B. M. Cwm-y-glo,
Llanbcris (on rocks, W. 'Watson), Cennant l\fawr, Nantygwrhyd,
Snowdonia (on alder, D. A. Jones), Carnarvonshire.
Family IV. PYRENOPSIDACElE.
After Psorotichia pyrenopsoides, p. 42, add :-
Psorotichia lugubris Dal. Tor. & Sarnth Flecht. Tirol. 592
(1902); A. L. Sm. MQnogr. i. 487.-Thallus indeterminate,
thickish, minutely squamulose, granulose-concrete, breaking up
into crumb-like portions, brownish or chocolate-grey (K-,
CaCI-); hypothallus black. Apothecia generally scattered,
small or submoderate, superficial, plane, margined, black, the
margin thickish, prominent, entire, occasionally subflexuose,
persistent; paraphyses slender, very loosely coherent, thickened
at the apices,. the epithecium dark-green; hypothecium blackishbrown;
spores spherical or subspherical, halonate, 8-9 tJ. diam.
(or 12-15 tJ. X 9-12 tJ.); hymenial gelatine bluish with iodine.­
Lecidea lugubris Sommerf. Suppl. Fl. Lapp. 143 (1826), pro parte;
Nyl. in Bot. Not. 176 (1852); Linds. in Quart. Journ. Microsc. Sci.
v. 177, t. 11 (1857); Cromb. Lich. Brit. 85; Leight. Lich. Fl.
31)2