Baden-Württemberg - Lichens of Wales

see Porpidia soredizodes
40* Soralia mostly larger, rounded to irregular, even
coalescing. Thallus commonly extensive
Pertusaria
41 Thallus K+ yellow with Atranorin
GS Lecanora/PT2
41* Thallus K- (possibly soralia K+ yellow) 42
42 Medulla I+ blue GS Lecidea/PT5
42* Medulla I- 43
43 Thallus pale greenish, gray-greenish, slightly
yellowish-green even almost gray, KC+
yellow/KC-, of flat to convex areoles or fissured
areolate, with defined soralia or in the center
soon disintegrating into flat soredia. Usnic acid,
Zeorine . Lecanora
43* Thallus white to gray, KC- 44
44 Thallus extensive, coherent, ± fissured, with large
round soralia, often with clearly defined zones,
gray to greenish prothallus .
Pertusaria albescens
44* Thallus without definite prothallus or with black
prothallus GS Lecidea/PT 5
Key VIIIc: Sterile Crustose Lichens on
Bark
1 Thallus sorediate . 2
1* Thallus not sorediate 63
2 Thallus C+/KC+ (yellow)orange or red . 3
2* Thallus C- to C+ yellow, not KC+ orange or red
(but in the case of Pertusaria amara KC+ violet,
in Lepraria eburnea very fleeting reddish) 17
3 Thallus usually yellowish, green-yellowish, grayyellowish,
yellowish-green, or ochre, C+ yelloworange
to orange .4
3* Thallus C+ rose to red (orange-red) . 7
4 Thallus finely isidiate, the isidia sometimes
becoming partially sorediate .
Pertusaria flavida
4* Thallus not isidiate . 5
5 Thallus with defined soralia, gray-white to pale
yellowish, gray-yellowish to slightly greenish.
Soralia pale yellowish. Arthothelin, Granulosin
Thiophanic acid, Capistraton GS Lecidella
5* Upper surface of the thallus generally soon
entirely sorediate . 6
6 Thallus/soredia ochre, pale yellow to pale
yellow-greenish, even pale brownish-green,
sometimes with blackish prothallus, K-, C+
orange, UV+ (brown)orange, without
crystallizing needles. Soredia -50 µm.
Isoarthothelin, Thiophanic acid .
Pyrrhospora quernea
6* Thallus/soredia pale yellow-greenish, pale
greenish, rarely partially also pale ochre-yellow,
sometimes with whitish, rarely bluish prothallus,
K+ yellowish, C+ yellow-orange, UV-/UV±
violet, in the herbarium often covered with the
finest crystallizing needles. Soredia -50 µm.
Usnic acid, Thiophanic acid, Zeorine, ±
Arthothelin. . Lecanora expallens
7 Thallus partially orange, there K+ red, otherwise
pale greenish, light gray, greenish-gray, K-,
extensive, coarsely granular, with greenish-white,
even partially orange colored, at first convex,
then fleck like to coalescing soralia, P-. Soredia
fine, -25 µm. Gyrophoric acid, anthra-quinone
Trapeliopsis pseudogranulosa
7* Thallus not flecked orange. K-/K+ slightly
yellowish 8
8 Thallus permanently finely isidiate in the center,
light gray, light greenish-gray to whitish. Isidia
delicate, soon disintegrating into whitish to
greenish-gray soredia, spherical to mostly
cylindric (to coraloid ), -1(0.2)mm thick.
Without well defined soralia, often with whitish
prothallus. UV+ blue-white. Gyrophoric acid .
Ochrolechia subviridis
8* Thallus without isidia, clearly sorediate . 9
9 Thallus P+ yellow(orange), C+ (often fleeting)
red, with alectorialic acid . 10
9* Thallus P-, without Alectorialic acid, with
Gyrophoric or Lecanoric acid . 12
10 Thallus of mostly scattered, ascending, convex,
often indefinite squamules with lip soralia,
whitish Hypocenomyce leucococca
10* Thallus not of ascending squamules 11
11 Thallus areolate to indefinite (in the substrate),
yellowish-gray to slightly ochre or light gray,
with diffuse yellowish, pale yellowish-green,
yellowish-brown (in the herbarium often rose
colored) soralia, K+ yellow. Soredia 20-50 µm
Hypocenomyce sorophora
11* Thallus granular, thin to thick, irregularly finely
mealy sorediate disintegrating, dark graygreenish
to dark brown-gray, thin to thick, K-.
Soredia 12-22 µm thick Buellia pulverea
12 Thallus with lichexanthon, gyrophoric acid, thin,
smooth, whitish. Soralia UV+ orange, flat to
slightly concave, rounded, whitish, cream colored
to slightly greenish, 0.3-0.7 mm wide, soredia -70
µm . Ochrolechia arborea
12* Thallus without Lichexanthon, UV-/± white.
Soralia ± flat to convex 13
13 With Lecanoric acid., C+ (carmine)red reaction
above all in the medulla/in the soralia. Thallus
with whitish, shiny, often zoned prothallus,
smooth to unevenly warty, toward the margin
mostly with fissures, fissured to the thallus
center, silver-gray, gray-white, or gray. Soralia
whitish, convex (to hemispherical), -1.3(1.8) mm
wide, also coalescing. Very often in association
with Pertusaria coccoides or flavida .
Pertusaria hemisphaerica
13* With Gyrophoric acid, C+ (rose- to orange)red
reaction in the soralia/ in or upon the bark.
Thallus without, rarely with whitish prothallus.
Soralia flat to convex . 14
60