Baden-Württemberg - Lichens of Wales

66 Thallus with Trentepohlia algae, when scratched
or scraped often orange to gold brown (in
problem cases check alternatives!) . 67
66* Thallus not with Trentepohlia, commonly with
true green algae 80
67 Sp. 2-celled . 68
67* Sp. with more than 2 cells . 71
68 Paraph. reticulate bound. Exc. Reduced, very
thin to lacking. Ap. without margin. Hym. I+
(yellow)orange, dirty gray-blue or blue. Asci
thickened above Arthonia
68* Paraph. simple to sparsely forked. Exc. Clearly
developed. Ap. with or without margin. Hym. I-
or I+ blue . 69
69 Ap. whitish to orange, with concave to flat disks.
Hyp. (Exc. ±) colorless. Spores fusiform to
ellipsoidal. Thallus thin, light gray to green,
film-like to scruffy, on bark and mosses
Dimerella
69* Ap. dark. Hyp and exc. dark or light 70
70 Sp. at first colorless then brown, cells sometimes
unequal in size. Ap. rounded to streaked, black.
Thallus indefinite. Asci I- Melaspilea
70* Sp. remaining colorless, cells equal in size. Ap.
rounded, black or dark red-brown. Asci I+ blue
at least above. GS Catillaria
71 Ap. Not black . 72
71* Ap. black, however sometimes pruinose. . 74
72 Sp. to 16 or more per ascus, long fusiform to
almost thread-like, -5 µm wide. Ap. brown-red
to orange-brown, -0.6 mm, with concave disk.
Asci not thickened at the apex. Epihym. Brown.
Hyp. colorless. On bark. Pachyphiale
72* Sp. 8 per ascus 73
73 Ap. bordered, with clearly developed exc., disk
often concave or deeply sunken. Asci usually
very lax, cylindric-clavate. Sp. long fusiform to
ellipsoidal. Ap. yellowish, rose, red, or (dark)
brown. On bark, soil, rock, or plant residue
GS Gyalecta
73* Ap. without margin, exc. reduced. Asci broad,
wall strongly thickened above . Arthonia
74 Sp. needle-form, 50-80 x 1.5-2.5 µm,
multicellular, disintegrating in short segments.
Ap. black. Thallus whitish, almost exclusively
on oak bark GS Lecanactis: Bactrospora
74* Sp. shorter, not disintegrating into small pieces,
usually fusiform . 75
75 Paraph. simple or with scattered branches, in
other parts occasionally bound. Sp. 4-celled,
with perispore, 12-28 x 6-9 µm. Asci thin
walled, with thick tholus, not fissitunicate, wall
I+ blue. Exc./hyp. dark brown. Ap. black (redbrown
when fresh), often with split margin. On
calcareous rock . Sagiolechia
75* Paraph. branched and reticulate bound. Asci
thick walled, fissitunicate . 76
76 With strongly developed dark receptacle/exc.,
without thalloid margin. 77
76* Receptacle/exc. reduced, with or without thalloid
margin . 79
77 Ap. almost perithecia-like, with narrow
punctiform disks. Dark exc. only developed in
places, hyp. light. Thallus (dark) brown, with
lighter soralia, commonly with a dark prothallus.
. Enterographa zonata
77* Ap. with wide open disks. Dark exc. even the
underside developed, producing a cup-like
receptacle . 78
78 Ap. often not uniformly rounded, disks
sometimes with an umbo or groves. Receptacle
black, underside often strongly developed. On
rock . Opegrapha
78* Ap. usually uniformly rounded, often pruinose,
with smooth disk, usually with proper margin.
Receptacle black-brown. On rock and bark .
Lecanactis
79 Ap. with a finally inconspicuous, black, rarely
pruinose thalloid margin differentiated from the
thallus. The fresh thallus slightly reddish, the old
(in the herbarium) whitish to cream colored. Sp.
4-celled, fusiform, 25-42 x 2.5-4 µm. Hyp. dark.
On bark . Schismatomma abietinum
79* Ap. without thalloid margin, uniformly to
irregularly rounded or short lobed, without
margin, brown to black, sometimes thickly white
pruinose. Sp. -25 µm long . Arthonia
80 Ap. margin separated from an at first narrow
central star-like ap. opening in 4-8 triangular
lobes. Disk concave, rose, rose-brown, or
yellowish. Ap. extensively up to half sunken in
calcareous rock. Sp. 4-celled. Thallus indefinite.
With Scytonema algae Petractis clausa
80* Ap. margin not set off star-like from the center.
Not with Scytonema algae, but with green algae
81
81 Ap. disk yellow, orange, or brown-orange, K+
immediately deep red. Sp. 2-celled. . Caloplaca
81* If ap. disk yellow to orange colored, then not
immediately K+ deep red . 82
82 Ap. margin with algae (in section), externally
almost always colored as the thallus 83
82* Ap. margin without algae, generally colored like
the disk, or without a margin . 86
83 Ap. disk yellow, dirty yellow, or orange, K- to
gradually slightly reddish. Sp. 2-celled. Thallus
yellow or gray . Candelariella
83* Ap. disk not yellow to orange . 84
84 Sp. sometimes 30 µm long, fusiform to needlelike,
with (1)3-7 cross-septa. Ap. red, K+ dark
red or blue, or rarely the ap. brown, nonpruinose,
concave to moderately convex. Hyp. ±
colorless . GS Haematomma
84* Sp. shorter, 2-4 celled. Ap. not red 85
85 On decayed wood, peat, raw humus, or mosses,
very rare on acid silicate rock. Ap. rose or rose
beige, at first with whitish margin, 1-3 mm
Icmadophila (91)
53