GRAPHIS SCNIPTA - Universitetet i Oslo

9?, Enk Larsen GRAPHTS SCRTPTA 7 (Lees)
Table 1. Differences between Bacid.ia amoldiana, B. egenula, and B. caligans.
Hypothecium
Upper outer part of exciple
Inner part of exciple
B. arnoldiana B. egenula B. caligans
dark red-brown
colourless
red-brown
species was described by Fries (L867) as a
parasite on Lecanora varia first attacking the
apothecia. Poelt (1974) gives further information
on the parasitic nature of Lecidea insid,iosa.
In my material, however, no traces of an
host was seen, and Lecid,ea insid,iosc seems to
be exclusively autonomous on the wood.
The granular to warted-areolate thallus is
grey and K+ yellow. The photobiont layer
comprises a great part of the young areolae
with a corresponding thin (or absent) medulla
(Figure 1), whereas older areolae have a
thicker medulla and I+ violet hyphae. The
photobiont is green, 7 -15 ltm. Over the
photobiont layer there is an amorphous layer
which is more or less densely incrusted by pale
to dark brown granules which refract polarized
light and dissolve in K but not in N. The
apothecia are black, numerous, 0.2-0.5 mm, at
first plane with a thin margin but soon become
convex an immarginate, in water with a bluish
bloom. The epithecium is blue-green (N*
red), with a layer of brown granules that
dissolve in K. The exciple is green-brown in
the outer part, paler in the inner, I+ violet.
The hymenium is 40-50 pm high, colourless
-J.. ;'-
Figure 1. Vertical section of young areolae
Lecidea insidiosa. Scale = 100,,nm.
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of
I red-brown
green-brown
colourless
colourless
red-brown
colourless
like the hypothecium. The spores are 7 .5-11 x
4.5-5.5 pm.
Specimens examined: East Iutland; Tidal
meadow at Odde Sommerland, 2 km north of
Als Odde, East Jutland, 1994, I-arsen (C, herb.
larsen).
Psorotichia schaereri (A. Massal.)
Arnold
Psorotichia schaereri was found as
green-black coverings on bricks laying on the
ground in the same place as the two Bacidiaspecimens
mentioned above. The thallus was
covered with granular isidia and the immersed
small apothecia (up to 0.5 mm) had a
red-brown disc and a pale proper margin. The
hypothecium was more or less wedge-like and
the exciple, which only consists of a few parallel
running hyphae, was at least in mature
apothecia open at the base. According to Ellis
(1981), this feature should separate Psorotichia
from Lemmopsis.
Ramkrer (1978) included Psorotichia
schaereri in the Danish flora on the basis of a
finding by D. Branth from .lEgholm borgruin.
Branth called the material Pannaria nigra, but
Hellbom corrected it later to Pannaia
schaereri. Alstrup (1989), however, determined
Branth's material as Pannaia leucophaea and
hence deleted Psorotichia schaerei from the
Danish flora.
Specimens examined: East lutland: Alling
Klosterruin, 2N m east of Alling s0, GrOnbrek,
L994, larsen (C, herb. I-arsen).