BRITISH LICHENS

394 APPENDIX
Acarospora, p. 333.-A monograph of the genus Acarospora
has recently been published by A. H. Magnusson in Goteb. K.
Vet.-och Vitt.-Samh. Handl. xxviii. 2, 1-149, 3 pIs. (1924). A
continuation of this work appeared in Svensk. Bot. Tidsk. xviii.
329-342 (1924). We owe cordial thanks to Dr. Magnusson for
giving us the results of his examination of the British Museum
specimens during a visit to London in 1925. He has found
changes in nomenclature-and in some instances in determination
-to be necessary, and has delimited a number of species not
hitherto recognized by British lichenologists.
Thc rcsults of his work, so far as they affect the British Lichen
Flora, are as follows :-
Instead of Acarospora squamulosa Th. Fr. (p. 333), read ;-
Acarospora macrospora Th. Fr. Lich. Arct. 88 (1860).­
Magnusson rejects the generally accepted A. squarnulosa, which
was based on Schrader's Lichen squarnulosus, as that lichen has,
according to Arnold (Flora lxiii. 378 (1880)), a distinctly red
reaction with OaOl. The more recent citations by Acharius and
others only partly belong to that plant, hence the adoption of
Myriospora macrospora (K -, OaOI -) Hepp Exs. 58 (1855) as the
type specimen. Schrader's L. squarnulosus with the positive
o reaction belongs doubtfully to A. peliocypha (see p. 338).
Form albomarginata has been identified as var. incusa Magn.
-A. castanea f. incusa Koerb. Parerg. 59 (1859).
A. glaucocarpa (p. 334).
Var. depauperata.-Magnusson distinguishes three forms in
this variety: (1) f. depauperata Koerb.-thallus almost obsolete,
apothecial margin thick and more brightly coloured than the disc;
(2) f. sarcogynoides (Wain.) ,-thallus obsolete, the apothecia with a
reddish margin, though passing over to f. depauperata; and (3)
f. melaniza (Nyl.),-thallus obsolete and apothecia pruinose.
A. smaragdula (p. 336).
The chemical reaction of this species has unfortunately been
given in British text-books as K -, OaOI -; it is now limited to
specimens that react Ie + red or reddish; a reaction recorded by
Magnusson only in this species, in A. Lesdainii and in A. subnifula.
He notes also that the under side is pale, thus separating off A.
subrufula, in which the under side is dark. He considers it as
probably a nitro phIlo us species growing freely where dust
accumulates.
A. smaragdula var. sinopica (p. 337).
This variety is treated by Magnusson as a species, A. sinopica
Koerb. Syst. Lich. Germ. 156 (1855) (excl. var. smaragdula).-A
very distinctive plant owing to the infiltration of the thallus by
ferric oxide. The areolre are as a rule more contiguous than in