316 Transactions.— Botany. 
the thallus, sometimes bound by a spurious thalline minutely granular 
margin. Spores minute, ovoid or globular, length -0065 mm., breadth 
"005 mm. Gonidia large. Hypothecium brown. 
On rocks. 
Fig. 6. Ascus and spores magnified 300 diameters. 
Lecidea sublapicida, Knight. 
Thallus granulosus indeterminatus cinereo-albus. Apothecia in thalli 
lacunis sepissimé confluentia adpressa aterrima nuda planiuscula v. con- 
caviuscula, margine tenuissimo atro undulato, paraphysibus tenuis conglu- 
tinatis. Spore in ascis ventricoso-clavatis parvule ovoider simplices hya- 
line, longit. 005 mm., crassit. 004 mm. Stratum hypothecii subhymeniale 
atrum. ; 
Ad saxa. 
Thallus granular, indeterminate, greyish-white. Apothecia most fre- 
quently confluent in lacuna of the thallus, adpressed, very black, naked, 
flat, or a little concave; margin very thin, black, undulate; paraphyses 
slender, conglutinate. Spores in ventricose clavate asci, small, ovoid, 
simple, hyaline ; length -005 mm., breadth -004 mm. — stratum 
of hypothecium black. 
On rocks. 
Fig. 7. Section of apothecium magnified 14 diameters. 
7. a, Ascus and spores sx 3 308 es 
Differs from L. lapicida in its smaller ovoid spores, much finer para- 
physes, and black hypothecium. In L. lapicida the subhymenial stratum 
is slightly colored, and the inferior stratum forms a thin black line con- 
tinued from the margin. 
Lecidea subcoarctata, Knight. 
Thallus cinereo-albus areolatus v. areolato-granulosus v. continuus. 
Apothecia conferta fusca v. atro-fusca adnata sat parva convexa, margine 
integerrimo pallido v. dilute fusco nudo demum evanido. Spore in ascis 
ventricoso-clavatis simplices ovoider incolores, longit. -011 mm., crassit. 
007 mm. Hypothecium album. 
Ad saxa. 
Thallus greyish-white areolate or areolato-granulose or continuous. 
| Apothecia crowded, brown or dark brown adnate, rather small, convex, 
- Inargin quite entire, pallid or pale brown, naked, at length vanishing. 
