SriLankaLichens_Book_eng - page 17

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41 Thallus thick, strongly
wrinkled 42
41
Thallus thin, papery,
smooth to shallowly
striate
43
42
Margin of apothecia
smooth. Upper surface
without cortex
Collema
coilocarpum
(Müll. Arg.)
Zahlbr.
42
Margin of apothecia
strongly rugose or
phyllidiate. Upper
surface with a thin
cortex of isodiametric
cells (microscope!)
Leptogium
phyllocarpum
(Pers.) Mont.
43
Thallus minutely
striate. Margin of
apothecia often with
concentric ridges
Leptogium
cochleatum
(Dicks.) M.Jørg.
& P.James
43
Thallus smooth.
Margin of apothecia
smooth or toothed
Leptogium
azureum (Swartz)
Mont.
44
Thallus with marginal
soredia. Upper surface
hairy
Leioderma
sorediatum D.J.
Galloway & P.M.
Jørg.
44
Thallus with isidia.
Upper surface not
hairy
45