NEW BRITISH LICHENS. 
23 
3. Lecanora umbrinofusca, Nyl. in Flora , 1880, p. 389. 
Thallus macular, umbrine-brown or umbrine -blackish, thin, sub- 
continuous or obsoletely rimulose, usually surrounded by a lead - 
coloured subphumoso-radiating hypothallus; apothecia black, 
lecideoid, minute, adnate, submargined, spores 8 nae, brown, 
ellipsoid, 1-septate, 0-010-11 mm. long, 0-006-7 mm. thick, 
epithecium brown, hvpothecium colourless. 
Apparently allied to L. grisco-fusca , Nyl., but differing in the 
character of the thallus, the smaller spores, &c. 
On siliceous stones at Thetford, in Sussex (Larbalestier). 
4. Lecanora rhagadiza, Nyl. in Flora , 1881, p. 178. 
Thallus dark olive-greyish, continuous, unequal, variously 
rhagadiosely fissured : apothecia reddish flesh-coloured, innate, 
concave or plane; thecae my riospored, spores oblongo -bacillar, 
about 0-0035 mm. long, about 0-0010 mm. thick, paraphyses 
slender, hymenial gelatine tawny wine-red with iodine. 
A peculiar species, allied to L. rufescens (Borr). On moist sand- 
stone rocks at Whitehaven in Cumberland (Rev. W. Johnson). 
5. Pertusaria spilomanthodes, Nyl. in Flora, 1881, p. 179. 
Thallus greyish, rugoso- unequal, rimoso-diffact (K + yellow and 
immediately rusty saffron-coloured) ; apothecia blackish, rugoso- 
deformed, innate in the thalline areolae, subincolorous within ; 
spores 8 nae, olive-blackish, 0-090-0-130 mm. long, 0 055-85 mm. 
thick : the thecae especially bluish with iodine. 
Allied to P. spilomantha, Nyl., but differing in the greyish 
thallus and the 2-spored thecae. 
On granitic rocks at Ennerdale, Cumberland (Rev. W. Johnson). 
6. Lecidea rhypodiza, Nyl. in Flora, 1881, p. 5. 
Thallus brownish-black, thin or very thin, subgranulated, 
indeterminate, apothecia concolorous or subblackish, plane, 
margined; spores 8 nae, colourless, oblong, 1-septate, 0-014-16 
mm. long, 0*005-6 mm. thick, epithecium and perithecium 
brown, paraphyses moderate, clavate and thickened at the apices, 
hypothecium colourless ; hymenial gelatine bluish and then led 
wine-coloured with iodine. 
Belongs probably to the section of Lecidea lenticularis , though 
in the absence of the spermogones this is somewhat uncertain. 
On micacco-schistose rocks on the summit of Craig Calliach 
(Crombie). 
7. Odontotrema firmatum, Nyl. in Flora, 1881, p. 188. 
Subsimilar to O. subintegrum, Nyl., but more robust, with black, 
larger, somewhat prominent apothecia; (spores fusiform, 3-septate, 
0*020-24 mm. long, 0*006-7 mm. thick). 
On the wood of a decorticated felled pine on Ben Lawers 
(Crombie). 
In addition to these Nylander, l.c., 1881, pp. 188-189, describes 
the following form and subspecies : — 
1. Stigmatidium circumscriptum f. dendrizum, Nyl. 
Apothecia punctiform, dendriodeo-subcontiguous and seriated ; 
