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Lecanora leprosa
Fée
Thallus crustose, continuous or rimose-areolate to verrucose-areolate, yellowish
white to yellowish grey or yellowish green, smooth, epruinose, esorediate, the
prothallus white or not visible. Apothecia lecanorine, subimmersed when young,
sessile when mature, 0.3-0.8 mm in diam., the disc orange-brown or yellowish
brown, plane, epruinose, the margin concolorous with thallus, thin or thick,
persistent or becoming excluded, even, not flexuose, smooth, entire or verrucose
or verruculose; epihymenium red-brown to orange-brown, with crystals
dissolving in K. Spores colourless, simple. Photobiont: chlorococcoid. Spot-
tests: thallus and apothecial margin K+ yellow, C-, KC-, P+ pale orange. - Rare,
mostly found in humid forest areas above 1000 m, on the bark of trees
(Knuckles mountain region and Matale District).
Lecanora tropica
Zahlbr.
Thallus crustose, dispersed-verrucose to verruculose or continuous to nearly
byssoid, ecorticate, yellowish white to yellowish grey or whitish grey,
epruinose, esorediate; prothallus not visible or black. Apothecia lecanorine,
sessile, 0.2-0.5(-0.8) mm in diam., the disc pale to dark red-brown, the margin
concolorous with thallus, thick, verrucose to verruculose; epihymenium reddish
brown, without crystals. Spores colourless, 1-celled. Photobiont. chlorococcoid.
Spot-tests: thallus and apothecial margin K+ yellow, C+ orange, KC+ orange,
P+ yellowish orange. - Very common in humid forest areas above 400 m on the
bark of trees (Kandy, Kegalle, Sinharaja forest, Gampaha, Matale, Nuwara
Eliya, Ampara, and Kurunagala).
Leioderma sorediatum
D.J. Galloway & P.M. Jørg.
Thallus foliose, lobate, orbicular to irregularly spreading, 1-3(-4) cm in
diameter, rather loosely attached. Lobes to 6 mm wide, discrete to imbricate, the
margins slightly thickened, sinuous, subascendent, entire, delicately incised or
crenulate. Upper surface more or less uniformly arachnoid-tomentose, dark
blue-green when wet, pale-greyish or olivaceous-grey when dry, often with
pale, pinkish-brown apothecial initials. Lower surface white, ecorticate,
arachnoid especially at the margins, pale buff towards center, rhizinate; rhizines
white, buff to bluish, rarely blackened, in fascicles tufted at apex, in scattered
groups or more or less densely developed. Soralia marginal, often more or less
sinuous, linear to limbiform, occasionally round, spreading on to the upper (or
lower) surface; soredia coarsely granular, bluish. Apothecia rare (not seen in Sri Lankan material). Photobiont:
cyanobacterial. Spot-tests: all negative. - Only locally common in humid forests areas above 1400 m (Horton Plains,
few places along the Pattipola road and Ohiya Road, close to the Horton Plains entrance, Lover's Leap - Nuwara Eliya,
Knuckles and the Kalupahana peaks of the Knuckles mountain region).
Leptogium austroamericanum
(Malme) C. W. Dodge
Common name:
Dixie jellyskin
. - Thallus foliose, 2-5(-10) cm in diam., adnate,
subdichotomously to irregularly lobate, the lobes irregular, somewhat elongated,
separate, 2-10 mm wide, 100-200(-300) µm thick, the apices rotund, entire to
irregularly cut, isidiate, occasionally upturned. Upper surface usually medium
grey but sometimes brownish grey, usually dull, quite wrinkled (never really
smooth), with usually dense, laminal to marginal, usually cylindrical to flattened
isidia concolorous with the thallus or darker. 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: rare, laminal, sessile,
0.5-2 mm wide. Spores: colourless, 3-5-septate transversely, 0-1-septate longitudinally. Photobiont: cyanobacterial
(
Nostoc
). Spot-tests: all negative. - Rare on bark in humid high elevation forests above 1000 m (Near the Matale
District).
