SriLankaLichens_Book_eng - page 19

19
49
Thallus broad-lobed,
the lobes 0.5-2 cm
wide. Underside with
broad patches of dark
brown hairs
Lobaria discolor
(Bory) Hue
49
Thallus narrow-lobed,
the lober rarely
broader than 5 mm.
Lower surface without
hairs
50
50
Thallus without
marginal cilia and
usually without lateral
lobules. Upper cortex
paraplectenchymatous
(microscope!)
51
50
Thallus often with
marginal cilia and/or
with lateral lobules.
Upper cortex
consisting of periclinal
hyphae
52
51
With soredia. Lower
surface with
conspicuous red-
brown to brown-black,
corticate, ribbed or
nerve-like longitudinal
striations
Physcia atrostriata
Moberg
51
Without soredia.
Lower surface without
longitudinal striations
Physcia alba (Fée)
Müll. Arg.
52 Upper surface with
abundant cilia
Heterodermia
comosa (Eschw.)
Follmann &
Redòn
52
Upper surface without
cilia (cilia, when
present, confined to
the margins)
53