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338
Apothecia numerous, impressed or lying in the thalline level,
2—5 in each areola, 0.2—0.3(—0.5) mm. broad, dise round, con-
colorous with the thallus, without distinet margin.
Excipulum not always distinct, 8—15 «. Hypothecium more
or less distinetly yellowish, 25—50 u. Hymenium 90—110 su, white,
exterior 10 « brownish yellow, with J coloured pale blue. Para-
physes in water very diserete, not firmly coherent, more or less
distinctly capitate, 1—1.5 u thick. Asci about 50—60 X 15 u.
Spores more than one hundred, ellipsoid, 3—4 X 1.5 ww.
Pycnidia 100 X 70 u, not rare, sterigmata 8 su, conidia punctiform,
I 0:0 d
Habitat. On slaty siliceous rock, on the shore.
Locality,
Great Britain. Ireland, Dublin, Howth: Glenaveena (at high water
mark) and Baily Light-house 1922. Specimens in my herb., sent by the
collector, MATHILDA KNOWLES. Howth: Broad Strand 1911. B. M. KNOWLES,
(in The Museum at Bergen, Norway.)
Type specimens in my herbarium.
A. opaca resembles at first sight A. fuscata and has like this
species a blackish lower surface. But the absence of C-reaction, the
opaque, not lobate and dark areolae and the shape of the apothecia
are good specific characteristics. Perhaps it is more nearly related
to A. atrata Hue [Lich. morph. et anat. (1909) p. 142], but the
latter has contiguous areolae and elevated apothecia, according to
the description, and therefore they must be different species.
8. Acarospora sphaerospora |. Magn. n. sp.
Thallus areolatus, areolae dispersae vel paucae contiguae, medi-
ocres, pallide rufo-fuscae, irregulares, planae vel leviter convexae,
C+rubescentes, subtus pallidae. Apotheeia singula vel plerumque
pauca in quavis areola, punctiformia, minuta. Hymenium altum.
Sporae sphaericae.
Areolae mostly dispersed or a few contiguous, 0.4—0.5 mm. thick,
(1—)1.5—2 mm. broad, opaque, pale reddish brown, with irregular
somelimes sublobate outlines, unevenly plane surface or somewhat
convex, with CaCl;Os coloured distinetly reddish, lower side pale.
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