Baden-Württemberg - Lichens of Wales

habitats, like Parmelia stygia (↑), Char.
Umbilicarion cyl. – arct-bor-h’mo/alp – rare (3);
süSch, Vog, BayW, Erz, Hz; v.rare nöSch, Rhön,
?Ts, ThW, also Al
Cetraria sepincola (Ehrh.) Ach.
In montane to subalpine, mostly high
precipitation sites on temporarily very cold, late
frost endangered, high snowfall, rather variable
humidity habitats on acid bark and wood, in cold
air accumulating basins, in high and moss
overgrown, on peat bogs, below the tree line
almost only on bog-birch (rarely on alder), above
the tree line on dwarf pine with Parmeliopsis
hyp. (↑), r.-v.acidoph., r.-v.photoph., hygroph.,
v.ombroph., anitroph., in the region in the
Parmeliopsidetum and Pseudevernietum – bormieur-mo(-smed-subalp)
– rare (2); Sch, Vog,
Rhön, BayW, Av; v.rare O, Sp, Ju, Hu, Eif,
Sauerl, Erz.
LIT.: ANDERS 1928, HILLMANN 1936, KÄRNEFELT 1979,
1986 KÄRNEFELT & THELL 1993*, KÄRNEFELT ET AL. 1992,
POELT & VÈZDA 1981
Cetrelia W.Culb. & C.Culb.
(Determination ↑ Cetraria)
Introduction
The Cetrelia species are light to bluish gray
foliose lichens with broad, rounded lobes with
black, marginally brown underside and few
attachment threads. Characteristic are fine,
punctiform to short streak-form white
pseudocyphellae on the upper side. The
apothecia are rarely produced; they stand near
the lobe margins and are perforated in the center.
Several species produce border soralia.
The genus (ca. 15 species) is predominantly
distributed over the northern hemisphere,
especially eastern and southeastern Asia. The
three occurring in Germany, are closely related,
but genetically isolated species – they are also
chemical races – occurring in west Europe up
into southern Fennoscandia and in oceanic
regions of central Europe especially on
deciduous trees in near natural forests. They are
clearly in regression in the last decade.
Genus Characteristics
Thallus foliose, gray, blue-gray, even browned in
places. Lobes broadly rounded, upper side with
punctiform to elliptical pseudocyphellae, in the
case of the indigenous species with border
soralia, underside black, brown at the margin,
with simple rhizines. Cortex ± paraplectenchymatous.
Photobiont Trebouxia. Ap. central- to
marginally located, disk brown to brown-red,
usually perforated, with thalloid margin. Asci of
the Lecanora type. Sp. 1-celled, ellipsoidal.
Pycnosp. short bacillar, with slight swelling
toward the ends. Ch: Cortex with Atranorin,
medulla with depsides and depsidones.
Ecology and Distribution of the Species
Cetrelia cetrarioides (Del. ex Duby) W.Culb. &
C.Culb. (Parmelia c. (Del. ex Duby) Nyl.)
In montane and high montane, rarely even
submontane sites, above all in high precipitation,
relatively oceanic regions, on the bark of
deciduous trees and spruce, in lower sites like
Parmotrema chinense (↑), in higher sites like
Menegazzia and Lobaria pulm. (↑), m.r.acidoph.,
m.-r.photoph., r.-s.hygroph.,
anitroph., in the Parmelietum revol.,
Thelotremetum with Menegazzia, Lobarion –
s’bor-subatl-med(subatl) – rare (3); Vog, Sch, Al
& SJu r.rare, at times (v.)rare, today strongly in
regression: Ju, Ne, SFW, Bo, Do, Av, PfW, Hu,
We, Eif, O, Sp, Ts, He, ThW, Mn
Cetrelia chicitae W.Culb. & C.Culb.
In submontane, mild sites on the bark of
deciduous trees in forests, e.g. like Pertusaria
hymenea – atl – v.rare (1); SFW (1x)
Cetrelia olivetorum (Nyl.) W.Culb. & C.Culb.
(Parmelia o. Nyl.)
In montane and submontane sites, probably
bound less to high precipitation and oceanic
regions than C. cetrarioides, e.g. in the
Parmelietum rev., Pertusarietum amarae –
(v.)rare (3); süSch, Ju, Do, Bo, Ne, nöSch, O
LIT.: CULBERSON & CULBERSON 1968
Chaenotheca (Th.Fr.) Th.Fr.
(Key includes Sclerophora)
155