Baden-Württemberg - Lichens of Wales

gray to brownish. Rare, on base rich substrates .
. GS Physcia: Hyperphyscia
45* Thallus K+ yellow, not closely appressed, often
over 2 cm, underside (with exception of the lobe
ends) black, upper side white-gray or light
bluish-gray, rarely slightly brownish. Ap. usually
lacking, brown, lecanorine. Sp. 1-celled,
colorless 46
46 Lobes hollow, narrow to wide, often with soralia,
gray or bluish-gray, occasionally also brownish
Hypogymnia
46* Thallus lobes not hollow, narrow, high convex,
closely crowded, sometimes roof tile like,
without soralia, usually light gray (often
brownish overlaid). Underside black. On silicate
rock in the mountains
GS Hypogymnia: Brodoa
(If alternative 46 not correct, see also GS
Parmelia: a few species have at times very
sparse rhizines)
47 Ap. occurring. Key according to sp. characters .
48
47* Ap. lacking or occurring. Key without sp.
characters 50
48 Sp. brown to gray-green, 2-celled, ellipsoid, with
usually partially thickened walls. Ap. usually
blackish, sometimes pruinose GS Physcia
48* Sp. otherwise, colorless (if colored, 4-celled, see
bluegreen algae lichens) 49
49 Sp. 2-celled, ellipsoid to fusiform. Ap. ± brown,
protruding. Thallus small- and narrow lobed,
brown, when moist light brown to deep green
(with bluegreen algae) Massalongia
49* Sp. 1-celled Key further at 51
50 Rhizines viewed at right angles, bottlebrush-like,
black (Fig. P. 729, there are always more threads
attached to the rhizines than are shown, not only
on young rhizines), underside black, only the
margin sometimes pale. Thallus usually
brownish, but often pruinose. (Sp. brown, 2celled)
GS Physcia: Physconia
50* Rhizines mostly simple or further divided, never
bottlebrush-like 51
51 Thallus shiny brown to shiny black-brown, not
pruinose (only pruinose abnormally). (Sp. 1celled)
52
51* Thallus not shiny brown/black-brown . 54
52 Thallus lobes long streaked and sometimes
wrinkled, with ± peg-like to spherical warts with
pycnidia at the margins, underside with sparse
rhizines. On silicate rock in the higher mountain
sites Cetraria
52* Thallus lobes not wrinkled, without such warts
on the margins 53
53 Thallus undersid with sparse rhizines, pale
brownish to almost whitish, almost pillow-form
and thickly covered with ap. or with less dense
granular-sorediate lobes projecting from the
margins. Medulla and thallus R-. On bark and
wood Cetraria (sep./chloroph.)
53* Thallus otherwise, underside with sparse to
numerous rhizines, light to black, not pillowform.
Thallus/medulla R- or R+. On bark, wood,
or rock GS Parmelia
54 Medulla of the thallus (if there are soralia) C+
orange to red . GS Parmelia
54* Medulla of the thallus not C+ orange to red. 55
55 Thallus brown, sometimes also (partially)
pruinose 56
55* Thallus usually whitish, gray, gray-green or
green, without definite brown tint, only
occasionally somewhat browned at the margins
62
56 Upper side usually flecked to completely
pruinose (at least on the lobe ends). Underside
whitish (only slightly brownish toward the
center). Lobes sorediate to isidiate on the
margins, later also over the surface, cortex and
medulla R-. Ap. rare (sp. 2-celled, brown).
Thallus robust Physconia grisea
56* Upper side not pruninose 57
57 With laminal isidia and warts 58
57* Without or only with laminal isidia 59
58 Lobes over 0.5 mm wide. Isidia and warts only
laminal Parmelia
58* Lobes 0.3-0.5 mm wide, usually radiate-rosette
arranged, brown-gray to black-brown. Isidia
marginal and laminal, very dense in the center of
the thallus. Ch-. On limestone and dust
impregnated rock ↑Phaeophyscia sciastra
59 Lobes (sometimes isidiate becoming) bordered by
marginal soralia, ascending, loosely arranged, flat
to concave, often curved at the margin, 2-10 mm
wide, olive, olive-brown to brown, underside
pale brown, wrinkled, ± shiny, with sparse
rhizines. Thallus/medulla R-. Ap. very rare
Cetraria chlorophylla
59* Lobes without marginal soralia. Soralia, if
occurring, laminal . 60
60 Without soralia, often with ap . Parmelia
(If at the seacoast, thallus compressed, ± rosetted,
lobes elongated, brown, not pruinose, olive-green
when moist, ap. black-brown, with crenate
margins, sp. 2-celled, brown:
Anaptychia runcinata
(With.) Laundon)
60* With soralia 61
61 Thallus brown-gray to brown, medulla KC-.
Rhizines entirely black or with whitish tips,
dense, sometimes projecting beyond the thallus
margin. Lobes usually elongate, -1 mm wide,
rosetted to irregular, decumbent, dull with
whitish to often greenish- to dark gray circular
lichens, flat to convex soralia, underside black,
lighter only at the margin. Thallus K-, rare forms
with yellowish medulla and here K+ violet.
Phaeophyscia orbicularis
61* Thallus olive brown, or dark brown to blackbrown,
underside black to black-brown, also
brown at the margin. Medulla KC+ red or KC-.
42