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Leptogium azureum
(Swartz) Mont.
Common name:
Blue jellyskin
. - Thalllus foliose, 2-9 cm in diam., adnate,
subdichotomously to irregularly lobed, the lobes irregular, elongate, more or
less plane, separate, 1-5 mm wide, (50-)80-100(-150) µm thick, the apices
rotund, entire to lobulate, occasionally upturned. Upper surface bluish grey to
medium grey, usually dull, smooth to somewhat roughened but not wrinkled,
not isidiate. Upper and lower cortex consisting of a single layer of irregularly
isodiametrical cells, internally with loosely interwoven chains of
Nostoc
and
hyphae. Lower surface pale to medium grey, wrinkled, with scattered tufts of
white hairs. Apothecia common, lecanorine, laminal, sessile to short-stipitate,
0.2-2.5 mm wide, the disc light brown to red-brown, concave to plane, the
margin concolorous with thallus or cream-coloured, entire or occasionally with microphylline outgrowths. Spores
colourless, submuriform, 3-5-septate transversely, 0-1-septate longitudinally. Photobiont: cyanobacterial (
Nostoc
).
Spot-tests: all negative. -Common on bark in sub-humid to humid high elevation interior forests above 900 m (Matale
and Nuwara Eliya).
Leptogium cochleatum
(Dicks.) M.Jørg. & P.James
Thallus foliose, corticolous, adnate. Lobes fan-shaped, to 1 cm wide, the
margins rounded or somewhat toothed or lobulate. Upper surface blue grey to
lead grey, more or less rugose or striate. Upper and lower cortex consisting of a
single layer of irregularly isodiametrical cells, internally with loosely
interwoven chains of
Nostoc
and hyphae. Lower surface without hairs, usually
somewhat wrinkled. Apothecia lecanorine, laminal, sessile to substipitate, the
disc brown, the margin concolorous with thallus, thin, entire, more rarely thick
and phyllidiate. Spores colourless, submuriform. Photobiont: cyanobacterial
(
Nostoc
). Spot-tests: all negative. - Very common on bark and sometimes on
mossy, shaded rocks in humid interior forests above 1200 m (Matale and
Nuwara Eliya).
Leptogium cyanescens
(Rabenh.) Körb.
Common name:
Blue jellyskin, blue oilskin
. - Thallus foliose, 1-5(-8) cm in
diam., adnate, subdichotomously to irregularly lobate, the lobes irregular,
elongate, plane to slightly roughened (but not wrinkled), separate, 2-4 mm wide,
35-110µm thick; apices rotund, entire, dentate to irregularly cut and isidiate,
occasionally upturned. Upper surface light to medium grey, usually dull, smooth
to somewhat wrinkled, densely covered by laminal to marginal, usually
cylindrical to flattened isidia. Upper and lower cortex consisting of a single
layer of irregularly isodiametrical cells, internally with loosely interwoven
chains of
Nostoc
and hyphae. Lower surface light to medium grey, smooth, with
scattered tufts of white hairs Apothecia rare, lecanorine, laminal, sessile to
substipitate, 0.5-2 mm wide. Spores colourless, 3-septate transversely, 0-1-
septate longitudinally. Photobiont: cyanobacterial (
Nostoc
). Spot-tests: all negative. - Very common on all kinds of
bark, on logs or even on mossy, shaded rocks in humid interior forests above 900 m (Kandy, Matale and Nuwara Eliya).
Leptogium millegranum
Sierk
Common name:
Stretched jellyskin
- Thallus foliose, corticolous, adnate. Upper
surface dark olive grey, strongly longitudinally wrinkled, isidiate. Isidia mainly
marginal, sometimes on the ridges, globular to cylindrical. Upper and lower
cortex consisting of a single layer of irregularly isodiametrical cells, internally
with loosely interwoven chains of
Nostoc
and hyphae. Lower surface wrinkled,
with scattered tufts of white hairs. Apothecia common, lecanorine, laminal, cup-
like, the disc red-brown, the margin concolous with thallus. Spores colourless,
submuriform. Photobiont: cyanobacterial (
Nostoc
). Spot-tests: all negative. -
Rare on tree bark in humid mid- to high elevation interior forests above 900 m
(Matale and Nuwara Eliya).
