CRAPHIS ScnIPTA - Universitetet i Oslo

4 Rolf Santesson
irregularly arranged in the asci, hyaline, 1septate,
clavate to ellipsoid, the upper cell
somewhat broader, (9-)11-16 x (3-)4-5 pm.
Pycnidia often numerous, immersed in the
surface layers of the lichen, globose, 30-50,rm
in diam., wall pale brownish. Conidia bacillar,
4-5 x 0.8- 1.0 pm.
Specimens examined (all on Degelia plumbea
and all in UPS): Sweden. Smdland: on the
island Jungfrun, in the southern forest, on
Quercus, I9.Vl.l9l4, G. E. Du Rietz, will be
distributed as Santesson, Fungi Lichenic. exs.
L74. Vdsteryhtland: Mt Halleberg, V6nersniis
parish, Hallesnipen at Predikstolen, on
Populus tremula in a rather dark forest,
23.IX.I96L, R. Santesson, I4377c. Nonuay.
Hordaland: see above Wpus, G. Degelius.
More og Romsdal: BjOrkedalseidet, oD Sorbus
and Betula in an E-slope, 31..VIII.1933, T. E.
Hasselrot. Nordland: Evenes (Skf,nland?),
I-avangeidet above Evenes, J. M. Norman;
Kjerrin gay, 25.V.1807, G. Wahlenberg. British
Isles, Scotland. East Inverness: (V.C. 96), 3.5
km E of Fort Augustus, Gren Doc, 57o09'N,
4o38'W, alt. 150 m, on a trunk of Corylus
avellana in shaded situation, 26.V.I976, L.
Tibell 6538b; West Inverness: (V.C. 97), I-och
nan Uamh, 3-4 km E of Arisaig, on Fagus in
a Fagus forest. 12.VII.I969, R. Santesson
20243e.
Discussion
Stigmidium Trevisan (syn. Pharcidia Korber),
a genus in the Mycosphaerellaceae, requires a
monographic treatment. In Sweden and Norway
we know at present 20 species of a total
number of perhaps 40 species which are all
lichenicolous. Most species are confined to a
very restricted number of host lichens, only
few are found on species of different, nonrelated
lichen genera.
In many cases it is diffrcult to state the
true relationship betrveen the different species
of Stigmidium since the interpretation of the
evolutionary value of many characters is very
difficult.
A species which seems to be related to S.
degelii is S. schaerei (Massal.) Trevisan
GRAPHIS SCRIPTA 5 (lee3)
(Santesson 1960, Hawksworth 1983, Triebel
1989). The name ,S. schaereri has often been
used in a very broad sense, including several
species which are clearly different. S. schaerei
sensu stricto is a fungus living commensally on
the terricolous lichen usually referred to as
Dacampia hookeri. S. degelii has somewhat
larger and less protruding perithecia than S.
schaerei. Pycnidia are regularly found in S.
degelii and are often abundant. They have not
been found in S. schaereri.
It is diffrcult to get spores free from the
asci of S. degelii. At present a detailed study of
the spore size of this species compared with
other species of Stigmidium is not possible. It
has to be left until a monographic treatment of
the genus is made.
References
Arvidsson, L. & Galloway, D. J. L981: Degelia,
a new lichen genus in the Pannariaceae.
Lichenologist I 3 : 27 -50.
Degelius, G. 1935: Das ozeanische Element
der Strauch- und laubflechtenflora von
Skandinavien. Acta Phyngeogr. Suecica 7.
Hawksworth, D. L. 1983: A key to the lichenforming,
parasitic, parasymbiotic and saprophytic
fungi occuring on lichens in the
British Isles. Lichenologist 15: L-44,
Jorgensen, P. M. & James, P. W. 190: Studies
in the lichen family Pannariaceae IV: The
genus Degelia. Bibl. Lichenol. 38:
253-276.
Matzer, M. & Hafellner, J. l9X): Eine Revision
der lichenicolen Arten der Sammelgattung
Rosellinia (Ascomycetes). Bibl.
Lichenol. 37.
Santesson, R. 1960: Lichenicolous fungi from
northern Spain. Svensk Bot. Tidskr. 54:
499-522.
Timdal, E. l99l: A monograph of the genus
Toninia (kcideaceae, Ascomycetes).
Opera Bot. 110: t-I37.
Triebel, D. 1989: Ircideicole Ascomyceten.
Bibl. Lichenol. 35.
Vouaur, L. l9l2: Synopsis des Champignons
parasites de Lichens. Bull. Soc. Myc.
France 28: L78-256.