KEY to terricolous lichens - italic

15
Peltigera polydactyla
33
Thallus foliose, bluish- to brownish grey, shiny, smooth, loosely attached, K-, C-, KC-
, P-. Lobes >10 mm wide, elongate, flattened, contiguous, adpressed to the
substratum, with rounded ends. Edge dilacerate. Undersurface brownish at the margin,
darker in the center. Veins on undersurface flat, dark. Rhizines squarrose. Upper
cortex paraplectenchymatous. Lower cortex absent. Apothecia frequent, without a
thalline margin, subterminal. Surface brown, convex. Paraphyses simple, distinctly
thickened above. Asci clavate. Ascospores 4-celled, hyaline, acicular, thin-walled, 8
per ascus, (40)51-66(73) x 2.6-5.2 µ. Pycnidia dark, immersed. Conidia fusiform.
Photobiont cyanobacterial. - Note: predominantly a forest floor species, occurring in
more or less boreal forests amongst and over mosses, more rarely on rock or on bark,
on basal parts of old trees.
Thallus matt. Rhizinae pale. Veins pale
Peltigera hymenina
Thallus foliose, grey to brownish, often somehow maculate, smooth, loosely attached,
K-, C-, KC-, P-. Lobes >10 mm wide, elongate, flattened, contiguous, adpressed to the
substratum, with rounded ends. Edge up-turned, undulate. Undersurface pale, with
ochraceous veins. Veins on undersurface flat, pale. Rhizines pale, simple. Upper
cortex paraplectenchymatous. Lower cortex absent. Apothecia frequent, without a
thalline margin, subterminal. Surface brown, convex. Paraphyses simple, distinctly
thickened above. Asci clavate. Ascospores 4-celled, hyaline, acicular, thin-walled, 8
per ascus, (47)57-71(90) x 3-5 µ. Pycnidia dark, immersed. Conidia fusiform.
Photobiont cyanobacterial. - Note: on mineral soil in rather open, but never fully sunexposed
habitats, often associated with mosses.
33 Thallus shiny. Rhizinae dark. Veins dark
Peltigera neopolydactyla
Thallus foliose, bluish- to brownish grey, shiny, smooth, loosely attached, K-, C-, KC-
, P-. Lobes >10 mm wide, elongate, flattened, contiguous, adpressed to the
substratum, with rounded ends. Edge up-turned, undulate. Undersurface pale at the
margin, darker in the center. Veins on undersurface flat, dark. Rhizines dark, simple.
Upper cortex paraplectenchymatous. Lower cortex absent. Apothecia frequent,
without a thalline margin, subterminal. Surface pale to dark brown, convex.
Paraphyses simple, distinctly thickened above. Asci clavate. Ascospores 4-celled,
hyaline, acicular, thin-walled, 8 per ascus, 50-90(100) x 3-5 µ. Pycnidia dark,
immersed. Conidia fusiform. Photobiont cyanobacterial. - Note: predominantly a
forest floor species, occurring in more or less boreal forests amongst and over mosses,
more rarely on rock or on bark, on basal parts of old trees.
34 Lobes 10 mm wide 36
35 Rhizinae simple
Peltigera ponojensis
Thallus foliose, brownish, smooth, loosely attached, tomentose, K-, C-, KC-, P-.
Lobes 6-10 mm wide, elongate, flattened, contiguous, adpressed to the substratum,
with rounded ends. Edge up-turned, entire. Undersurface whitish. Veins on
undersurface raised, pale. Rhizines pale, simple. Upper cortex paraplectenchymatous.
Lower cortex absent. Apothecia frequent, without a thalline margin, subterminal.
Surface brown, convex. Paraphyses simple, distinctly thickened above. Asci clavate.
Ascospores 4-celled, hyaline, acicular, thin-walled, 8 per ascus, (29)38-58(65) x 2.6-
5.2 µ. Pycnidia dark, immersed. Conidia fusiform. Photobiont cyanobacterial. Isidia
marginal and along cracks of the upper cortex Lobes