B. Apotheoia biatorino-leoanorine ; spores 8næ, 1-septate, colourless ;
hymenial gelatine variously tinged w ith iodine. Spermogones
w ith shortly jointed sterigmata and stra ig h t sh o rt spermatia.
56. L. holophæa Nyl. Bull. Soo. Bot. t. viii. (1861) p. 755.—
Thallus determinate, squamulose, lurid-brown or oorvine-ohestnut ;
squamules firm, difform, suboontiguous or somewhat imbricate,
repand or obtusely crenate a t th e margins (K —,CaCl—). Apothecia
small, adnate, at first plane, with en tire thalline margin,
a t length convex and biatoroid, dark-brown or concolorous with
th e thallus : spores sometimes 6næ, oblongo-fusiform, 0 ,0 1 4 -1 8 mm.
long, 0 ,0 0 4 -5 mm. thiok ; paraphyses moderate, slightly incrassate
and infúscate a t tho apices, hypothecium colourless ; hymenial
gelatine and especially tlie apices of th e theoæ bluish w ith iodine.
—Carroll, Journ. Bot. 1866, p. 23 ; Cromb. Lich. Brit. p. 48 ;
Leight. Lioh. Fl. p. 227, ed. 3, p. 217.-—Psoroma holophæa Mont. in
Hist. Nat. Canar. (1840) p. 113. Thalloidima sublurida (Nyl.),
Mudd, Man. p. 1 7 2 .~ B r it. Exs. : Leight. u. 380.
Might readily he taken for a Lecidea allied to L. lurida, were it not
that the young apothecia, seldom present iu our specimens, are distinctly
lecanorine. Its true place is also well indicated by the character of tlie
spermogones, whicli are not unfrequeut. Our Herbaria specimens, owing
to the fragile nature of the habitat, are chiefly fragmentary, but in the
few which are perfect the thallus is small, orbicular, and well fertile.
Hah. On the ground in crevices of rocks and walls in maritime, very
rarely upland districts.—Bistr. Local in the Channel Islands, S. and W.
England, S. and N.E. Ireland.—B. M. ; Moulin Huet Bay, Island of
Guernsey. Pulborough, Sussex ; Bradstone churchyard and near Prawle
Point, S. Devon ; near Penzance, Cornwall : near Bridgenorth, Shropshire.
Ardglass, co. Down ; Sybil Head, cq . Kerry ; Coast of co. Clare.
Var. ft. glaucopsora Nyl. Flora, 1868, p. 164 ; cfr. p. 473.—
Thallus subeffuse, sqnamuloso-orenate, granuloso-squamulose or
suhleprose, glaucous- or greyish-whito (K —, CaCl — ). Apothecia
moderate, livid-brown, th e thalline margin suhentire ; spores fusiform,
0,0 1 2 -1 8 mm. long, 0 ,0 0 3 -4 mm. thiok ; paraphyses slender,
clavate and brownish a t th e apices.— Cromb. Lich. Brit. p. 4 8 ;
Leight. Lioh. Fl. p. 227, ed. 3, p. 218.—B rit. Exs. ; Larb. Cæsar.
n. 79.
Only a well-marked variety, though differing from the type in colour,
the less developed thallus, and some other minor characters. I t is rather
variable in texture, heeoming at length almost entirely leprose, tbe squamules
being only here and there visible. The thalline margin of the
rather scattered apothecia is persistent. The spermogones are not uu-
frequent with spermatia 0,003 mm. long, 0,001 mm. thick.
Hab. On rocks in maritime districts.—Distr. Only sparingly in the
Channel Islands and S.W. England.—B. M. ; Grosnez Common, Island
of Jersey; Saint’s Bay, Island of Guernsey; Island of Alderney. Near
Endellion and Penzance, Cornwall.
57. L. leu co sp e ire a Nyl. Flora, 1868, p. 473.—Thallus thinly
squamulose, white, opaque, th e squamules suborenate, _ adnate,
scattered, often granuliform (K —, CaCl — ). Apotheoia plane,
brown, subopaque, th e th allin e margin entire, w h ite ; spores oblong
or ovoideo-oblong, 1 -septato, 0 ,0 1 1 -1 3 mm. long, about 0,0035 mm.
thiok ; paraphyses slender, yellow-infuscate a t the apices ; hymenial
gelatine bluish, th en violet-coloured, w ith iodine.—Cromb. Lioh.
Brit. p. 48 ; Leight. Lioh. El. p. 227, od. 3, p. 218.
Allied to var. ft of the preceding species, with which it agrees in the
spermogones and otlier analytical characters, but differs in the white,
scattered, little developed thallus and iu the form of the smaller spores.
Nylander says that it may be only a subspecies of L. holophcea, which in
some habitats may readily pass into dissimilar secondary types. The
fragmentary specimen seen is but sparingly fertile.
Hah. On gravelly soil in a maritime district.—JFsir. Very rare in oue
of the Channel Islands.—B. M .: Boulay Bay, Island of Jersey.
58. L. R a lfs ii Cromb. Grevillea, ii. (1873) p. 13.—Thallus sub-
determinate, th in , continuous or slightly rimulose, frequently
rimoso-suboolliculose, smooth, leaden-grey or dark olive-green ( K - ,
CaCl—) ; hypothallus dark. Apothecia ra th e r small or minute,
biatoroid, sessile, somewhat prominent, plane, brownish or dark-
reddish-brown, th e margin th in , a t length excluded ; spores oblongo-
ellipsoid, often slightly constricted in the middle, 0 ,0 1 8 -2 3 mra.
long, 0,00649 mm. th io k ; paraphyses discrete or subdiscrete, jointed,
brownish a t the apices ; hymenial gelatine bluish, then violet-
coloured, with iodine.—Leight. Lich. El. ed. 3, p. 220 (excl. syn.
L . aetcea).—Lecidea R a lfsii Salw. Ann. Penzance Nat. Hist. Soo. ii.
(1853) p. 144. Biatorina M u d d ii (Salw.), Mudd, Man. p. 178.
Lecidea M u d d ii Cromb. Lioh. Brit. p. 3 7 ; Leight. Lioh. El. p. 315.
Lecanora jejuna Nyl. Elora, 1875, p. 4 4 2 ; Cromb. Grevillea, iv.
p. 181. Lecidea subdiluta Leight. Trans. Linn. Soc. Bot. i. p. 145,
t. 22. figs. 1 3 -1 6 ; Lioh. Fl. ed. 3, p. 340.—B rit. E x s . : Larb. Lioh.
Hb. nos. 134, 346.
A species hitherto not well understood, as may be inferred from the
variety of svnonyms, originating in slight differences of the thallus and
apothecia which depend upon age or habitat. In general appearance of
the thallus, as noticed by Nylander I. c., it approaches L. gihbosa, and lu
th a t of the apothecia it is sub.similar to Lecidea coarctata. Irom the
presence of gonidia in the margin of tlie apothecia and from the structure
of the spermogones, it is a true Lecanora of this section. grows
associated witli L. jn-osechoides and is usually well fertile. The spermogones
are frequent, with spermatia ellipsoideo-oblong 0,002 mm. long,
0,0006 mm. thick.
Hab On granitic and schistose rocks in maritime tracts.—Disfr. Local
in the Channel Islands, S.W. and N.W. England, the S.W. Highlands
and N E. Scotland, and in N.AV. Ireland.—B.M. : Boulay Bay, Island of
Jersey. Scilly Islands, the Lizard and near Penzance, Cornwall) B a riw -
mouth, Cumberland. Barcaldine, Argyleshire; Bay of Nigg, Kincardineshire.
Killery Bay, Oonnemara, co. Galway.
,J ' ’i