BRITISH LICHENS

APPENDIX 395
A. smaragdula and somctimcs placodioid-lobate at the circumference.
There is no chemical reaction with K or with CaCl,
thus differing from A. s1naragdula.
A. Lcsdainii (p. 334).
The thallus of this species as originally described gave the
reaction K + red. Magnusson in his Key to species contrasts it
WIth A. s1naragdula (K + red) thus :-
Thallus thin, plane, K + red. Apothecia rcgular ... A. smaragdula
Thallus thick, uneven, K - or yellowish. Apothecia irregular
A. Lesdainii
There is some misapprehension in Magnusson's description,
as Harmand based it on the reaction, K + red. It is, however,
distinct in "the thinner flattened areolro with small irregular
apothccia " (Magnusson in litt.).
A. scyphulifera Wain. Lich. Pitlekai in Ark. Bot. viii. n. 4, 147
(1909).-Thallus thin rimulose or areolate, the areolre round or
angulose, dispersed or more or less contiguous, forming a thin crust,
varying in colour from pale reddish-brown to testaceous or pale
and dirty ferruginous, firmly attached to the stonc (K -, CaCI -),
the under surface often darkened by particles from the stone.
Apothecia numerous, single or few in each arcola, the disc darkbrown,
concave, ·2-·4 mm. broad with a thick dark-brown margin;
asci 75 flo long, 13-15 flo wide; paraphyses coherent; rather slendcr,
not capitate; spores 2-3·5 flo long, 1·5 flo thick; hymenium 125-
150 flo high, yellowish-brown above, blue then wine-red with iodine.
-Magn. in Goteb. K. V ct.-och Vitt.-Samh. Hand!. xxviii. 2, 57
(1924).
Magnusson notes that the apothecium forms a Hattened cup,
mostly superficial on the thallus.
IJab. On mica· schist rock.-B. l'rI. Foxdale, I. of Man. Magnusson
has considered that this specimen collected by J. Hunter is probably the
above species. It had been included under A. Ulaucocarpa, but dIffers
in the hymenium, which in A. ulaucocarpa is only 65-75 po high and is
persistently blue with iodine.
A. verruciformis Magn. tom. cit. 58.-Thallus brown, subsquamulose-areolate,
the areolre semi-globose or verrucose,
loosely adherent, 1-3 mm. broad, dark-brown in the centre, the
margins light brown, mostly dispersed, some contiguous or conglomerate
in the cracks of the stone (K -, CaCI -). Apothecia
one or two in each arcola, ·2-·4 mn1. Wide, round, immersed,
blackish-brown With a dark-brown to blackish margin, and
concave or plane disc; paraphyses coherent, slender; spores
3-4 flo long, 1·5 flo thick; hymenium 120-200 flo high, somewhat
brownish-yellow, brownish upward, intensely dark-blue with
iodine.
Similar to A. smaraudula in the scattered partly light-coloured
squamules, but differs in the absence of chemical reaction and in the