Baden-Württemberg - Lichens of Wales

8 Ap. yellow, disk form. Thallus yellow
Pleopsidium
8* Ap. blackish to rust colored. Thallus red, or
yellow Acarospora (sinop., smaragd.)
9 Thallus sorediate 10
9* Thallus not sorediate. . 20
10 Thallus ± rounded rosettes, appearing lobed
(placoid) at the margin 11
10* Thallus squamulose, not rounded rosettes . 16
11 Thallus C+ red, with fleck soralia, with or
without brown cephalodia . 12
11* Thallus C-, always without cephalodia 13
12 Thallus of rounded rosettes, whitish, cream, or
light beige, with definite close together marginal
lobes, with bordered, often appearing ring-like
arranged fleck soralia, without cephalodia or with
warty cephalodia protruding in the center, -2 cm
wide. Ap. very rare, brown, lecanorine. Sp. 1
celled Placopsis gelida
12* Only the young thallus rounded, marginally only
very weakly effigurate (without clearly bordered
marginal lobes), slightly rose tinted, with
irregularly ordered irregularly border soralia,
always without cephalodia
Trapelia placoidioides
13 Thallus K+ yellow, with definite, close marginal
lobes and ± coalescing fleck soralia, gray-white
to slightly blue tinted light gray. On calcareous
rock, very rarely on bark. Diploicia canescens
13* Thallus K- . 14
14 Thallus with underside with patterned cortex,
also a foliose lichen, yet very closely attached to
the substrate and scarcely able to be loosened,
very thin and delicate, gray-green, gray, or gray-
-brown, with fleck soralia toward the center, with
narrow, smooth, definite lobules at the margin,
scarcely over 1.5 cm broad, underside light to
dark. On bark, rarer on rock
Hyperphyscia adblutinata
14* Thallus without patterned underside, entirely
crustose, not as easily loosened, underside
without cortex. On rock 15
15 Thallus brown, but often whitish pruinose, small,
usually scarcely over 5 mm wide, but often
growing together in large numbers, sorediate in
the center. On warm silicate rock overhangs
Lecanora (PT 1) dimissa
15* Thallus gray-white, mostly over 5 mm, only
weakly lobed at the margin, becoming granular
sorediate in the center. Predominately on walls
Caloplaca teicholyta
16 Squamules C+ red, mostly arranged like shingles
and with up-turned sorediate margins, light
brown, yellow- to gray-brown, or brown- to
gray-olive, 0.8-2.5 mm, mostly at the base of
trees, rare on silicate rock. Ap. rare, black, and
pruinose . Hypocenomyce scalaris
16* Squamules C- . 17
17 Squamules erect and ± shingle-like arranged,
sorediate at the margin (lip soralia), close
together, greenish-brown to brown, underside
pale brownish, without cortex. Apothecia
convex, without margin, brown, very rare.
Occurring on charred wood in higher regions
Hypocenomyce
17* With other characteristics; squamules generally
without brown tint, if ± shingle like in
arrangement, then the underside whitish to
yellowish 18
18 Very rare species with brown to gray margined
ap. and light gray-greenish to olive gray
squamules with lobed, sorediate eroding margins.
Soralia lip-form to almost capitate. On peat
Trapeliopsis percrenata
18* Ap. lacking 19
19 Squamules rounded, conchoidal to reniform, flat
to concave, with a definite elevated margin, light
gray, even with a light blue tint on the often
concentric undulating surface, 1-2 mm wide,
erupting, scattered to crowded soredia, above all
at the margin, R-. On (mossy) bark, rarer on
mossy rock. . . Normandina pulchella
19* Squamules rounded to irregularly entire margined
or crenate, gray-green to greenish white, not
appearing margined, with cortex, erupting
sorediate the margin or on the underside, not
undulating on the surface, generally crowded,
often erect, P+ red to P-, K+ yellow to K-, on
bark, wood, or soil Cladonia-thallus squamules
20 Thallus on bark or wood 21
20* Not on bark or wood 22
21 Squamules flat closely attached, brown, olivebrown,
olive-gray, gray-brown, or gray-green, R-,
decumbent to somewhat erect, without a clearly
differentiated underside. Ap. black, lecideine
.Hypocenomyce
21* Squamules only attached at the base, greenishwhite,
gray greenish, yellow greenish, or light
gray, erect, crowded, P+ red, yellow or P-,
underside clearly differentiated, whitish to
yellowish to orange at the base. Always without
ap . Thallus squamules of Cladonia
22 On soil, mosses, or lichens 23
22* Directly on rock 38
23 Lichens ± asteroid, only about 1 mm wide,
consisting of a deeply depressed black-brown ap.,
which is surrounded by ± triangular “lobules.”
Sp. many per ascus, 2 celled, 11-17 x 3-4 µm.
On loess Solorinella astericus
23* Lichens otherwise . 24
24 Thallus with very small blackish punctate
squamules (sunken per.). Squamules light to
dark brown, gray-brown, olive, or whitish,
usually on calcareous soil over mosses Key V
24* Thallus without per . 25
25 Ap. black, but sometimes whitish pruinose,
without thalloid margin, with/without proper
margin 26
25* Ap. not black or a;. lacking . 28
26 Sp. brown, 2-celled GS Buellia
50