rather difficult to arrange in the series, h’rom the gommia, it seems
to have its most appropriate place in this triho.
1. L. dendrisciim Nyl. Flora 1873, p. 195 (note).—Thallus very
much branched, intricate, slender, rounded or ohsoletely compressed,
opaque, greenish, or pale-yellowish a t th e base. Apotheoia small,
])alo or pkle-red, tho epitbecium a t len g th somewhat convex ; sporos
0 ,0 1 0 -1 6 mm. long, 0 ,0 0 6 -8 mm. thick.—Cromb. Journ. Bot. 1874,
p. 337 ; Leight. Lioh. Fl. ed. 3, p. V i.— Leptogium clendriscum Nyl.
Syu. i. (1858) p. 135. Leptogium Uooreii Hepp, Carroll, Journ.
Bot. 1865, p. 2 8 7 ; Cromb. Lich. Brit. p. 10 ; Leight. Lich. Fl.
p. 27. Ephebe byssoides Carring. Trans. Bot. Soc. Edinb. vii. p. 411,
t. 10. f. 2 .
This is one of the exotic lichens which find their way from suh-
tropical regions to the S.W. of Ireland. I t has^ a somewhat general
resemblance to Leptogium miiscicola, near to which it was onginally
placed by Nylander; hut the gonimia and other characters remove
it from Leptogium to an inferior position in the family. The apothecia
are not visible in any of the Irish specimens, the organs described as
such being spermogones. These, however, though not imfrequent as
minute pale-hrown tubercles, have not been seen rightly developed.
Jlah. On mossy trunks of trees in moist upland situations.—Dfsir. Very
local andrai-e iu S.W, Ireland.—B. M .; Glengariff and Glena, Killarney,
CO. Kerry.
Tribe I I . COLLEMEI Nyl. Mem. Soo. So. Nat. Cherb. ii.
(1854) p. 9 ; Syn. i. p. 93 {cfr. Cromb. GreviUea, v. p. 76).
Thallus usually memhranaoeous, lobed, laciniate or miorophylline,
occasionally frutiouloso-ramose, rarely crustaceous or granulose ;
gommia glaucous-green, more or less moniliform ; cortical layer
either cellular or indistinct. Apothecia lecanorine, sometimes
biatorine, rarely endooarpoid; spores Siiai, rarely numerous, ellipsoid,
ovoid or ra re ly fusiform, usually septate and divided, occasionally
simple, colourless. Spermogones w ith th e sterigmata a rticulate,
occasionally simple or subsimple, and oblong, ellipsoid or
haciUar spermatia.
This extensive tribe (notwithstanding its recent limitation) consists of
genera diverse in various particulars, yet sufficiently connected by m utual
links. I t contains the best-developed members of the family, and in
number of species, if not in their frequency of occuiTence, is very well
represented in our Islands. The plants for the most part very greedily
imbibe moisture, and we often find a marked contrast in the appearance
of the thallus when moist or dry.
12. SYNALISSA F r. PI. Horn. (1825) p. 2 9 7 ; Nyl. Syn.
i. p. 93.—Thallus pulvinatc, th in ly crustaceous or frutiouloso-
div id ed ; gommia (speirogonimia) either solitary or few, usually
scattered among th e filam en ts; cortical layer ohsoletely cellular.
Apothecia terminal, in n a te , leoanorino-endooarpoid, concolorous;
spores ellipsoid or ovoid,
h
i
0 ^
S jL /m
d
usually Snm, occasionally numerous,
simple, oolourloss ; hy menial
gelatine variously tinged
with iodine. Spermogones te rminal
or subterminal, with
simplish sterigmata and oblong
spermatia.
Distinguished from Ompha-
laria, which does not occur in our
islands, chiefly by the gonimic
granules; these are iu pairs
between the thalline filaments or
affi.xed to their branchlets. Only
two species occur with us, rarely,
aud generally in poor condition.
I . S. symphorea Nyl. Syn.
i. (1858) p. 94, t. 3. f. 2 .—
Thallus frutioulose, fastigiately
divided, opaque,hlack; branches
short, rounded, erect, obtuse a t
the apices, sometimes only nodulose.
Apotheoia minute,
punctiformi - impressed, a t Fig
length dilated, siibconoolorous, Synalissa symphorea Nyl.—a. Section of
thallus with an apntheeiuin, X 30
h. Section of a spermogone, X 3C
e. Syngonimia between the filaments
X 350. d. Gonimia affixed to a race
mosely divided filament, X 350. e. Spo
riferous theca witli three paraphyses
X 350. f . Pour spores, x 500.
Sterigmata and spermatia, X 500.
th e th allin e margin tum id ;
spores 8-24ii03, eUipsoid or
spherical, 0 ,0 0 9 -1 1 mm. long,
0,0 0 6 -7 mm. th ick ; hymenial
gelatine n o t tinged w ith iodine.
—Mudd, Man. p. 35, t. 1.
f. 2 : Cromb. Lich. Brit. p. 3 ;
Leight. Lich. Fl. p. 16, ed. 3, p. 13 .— Synalissa vidgaris Thwaites,
Ann. Mag. Nat. Hist. 1849, iii. p. 219. Collema symphureum DC. Fl.
F r. ii. (1805) p. 382. G. synalissa Ach., Tayl. in Mack. Fl. Hib. ii.
p. 108.
The thallus in our .specimens is generally only noduliform. Elsewhere
it often occurs amongst the squamules of Lecidea Imida, and further
research may discover it in Britain also similarly associated. A reference
to fig. 8 will show the peculiar ammgement of the gonimia affixed to
the branchlets of the filaments. The apothecia are very rare iu Great
Britain, and the spermogones are only seldom seen, with spermatia
0,003 mm. long, 0,001 mm. thick.
Ilnh. On calcareous rocks in maritime and upland districts.—Distr.
Local and rare, having with certainty been gathered only very sparingly
in S.W. England, and in the S.W. Highlands, Scotland; the Irish plant
being very doubtful.—B. M .: Portland Island, Dorsetshire ; Anstey’s
Cove, Torquay, Devonshire; St. Vincent’s rocks, Gloucestershire, Bar-
ealdine, Argyleshire.
11:1