476 CYCLOCARPINEZ [BACIDIA 
rarely straight, very slender, with 5 to 11 thin septa, 26-43 p 
long, 1-2 » thick. 
Near to B. effusa and B. herbarum, but differing in the characters 
of thallus and apothecia; with the latter and with B. arceutina var. 
hypnexa it agrees in habitat, though it differs in the colour of the 
thallus and in other particulars. 
Hab. Creeping over decayed mosses and thin dry humus on sand- 
dunes or on broken sandy banks overhung by herbage.—Distr. Rare 
in W. England (Lancashire) and N. Wales (Anglesea).—B. M. Formby, 
Lancashire. 
17. B. arceutina Branth & Rostr. (Part 2, p. 157.) 
Form deminuta Th. Fr. Lich. Scand. p. 353 (1874).—Apo- 
thecia small ; plane or concave and marginate.—Lecidea arceutina 
f. deminuta Stirt. Scott. Nat. v. p. 220 (1880). 
Stirton notes that the spores are 45-60 » long, 1-1°5 » thick, and 
scarcely septate. 
Form brevispora Wheld. & Trav. in Journ. Linn. Soc. Bot. 
xliii. p. 127 (1915).—Differs from the species in the shorter more 
strongly curved spores; they measure 25-38 yp long, 1*2-2°5 
thick, and are usually obscurely 7-septate. 
Hab. Incrusting decayed mosses on sand-dunes.— Distr. W. England 
(Lancashire). 
17a. B. salicicola Wheld. & Trav. tom. cit. p. 128.—Thallus 
scanty or evanescent. Apothecia rather small, varying from red 
to black, soon immarginate ; hypothecium colourless ; epithecium 
brown; spores cylindrical or fusiform, often attenuate at one 
end, generally curved, 29-35 p long, 2-3°5 p thick; hymenial 
gelatine blue then slowly wine-red with iodine. 
Differing from B. arceutina in the shorter stouter spores and 
sinaller apothecia, from B. Beckhausii in the often fusiform spores and 
other characters. 
Hab. On dead twigs and exposed underground stems of Salir 
repens on the coastal sand-hills.—Distv. Not uncommon on dunes in 
W. England.—-B. M. Formby, Lancashire. 
178. B. epiphylla Wheld. & Trav. 1. ¢.—Thallus almost 
evanescent, consisting of a few granules, green when fresh, 
cinereous when dry. Apothecia very minute, black, sessile, 
plane then convex, soon immarginate, colourless within ; epithe- 
cium pale-brown; paraphyses clavate, mostly colourless at the 
tips, slightly coherent ; hypothecium pale yellowish-brown ; asci 
narrow, 47 » long; spores slender, acicular, often curved at one 
end, multiseptate, 33-45 p Jong, 1-2 p» thick. 
Considered by the authors to be akin to B. arcewtina, but distinct 
in the smaller apothecia, the absence of a red tinge, shorter spores 
and peculiar habitat. 
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