GRAPHIS SCNIPTA - Universitetet i Oslo

News on lichens and lichenicolous fungi from the Nordic countries
VAGNAI5TRUP
Alstrup, V. 1993: News on lichens and lichenicolous fungi from the Nordic
countries. Graphis Scipta 5: 96-104. Stockholm. ISSN 0901 -7593.
The new species Anhonia aggregata, Chionosphaera lichenicola, Lecanora
polysphaeridi,a, Nigropuncta groenlandicq Sclerococcum veftucisporurry Srlgmidiam
microcalpurlt, Vouawiclla caloplacae and Zwac&tiomyces physciicola
are described. Further 10 species are new to Greenland, one is new to Finland,
and 1. L are new to Denmark. A sorediate form of Stereocaulon saxntile
and a yellow form of Lecanora dbpersa are described, and Collema bachmannianttm,
Mycobilimbi"a fusca and Taeniolella cladinicola are reported
from new localities in Denmark.
Vagn Alstrup, Department of plant ecologl, Univercity of Copenhagen, O.
Farimagsgade 2D, DK-1353 Copenhagen K Denmark
The material treated in this paper was collected
and identified by myself, and is kept in
C, if not othenrise indicated. The majority
originates from Greenland and Denmark, but
a few collections from other Nordic countries
have been included.
Arthonia aggregata Alstrup, M. S.
Christ. & Hafellner sp. nov.
Ascomyces pathogenes, lichenicola, faciens
maculas in thallo hospitis. Ascomata formata
inter dua strata horizontalia hyphorum fuscorum
sterilium, stratum superius tegens corticem
hospitis, stratum inferius infra algas,
inter se connexa hyphis fuscis. Ascomata
maturescentia perfringunt stratum superius et
aggrediuntur ascomata propinqua. Asci
arthonioidei, clavati, ad apices I-, cytoplasmatae
antea K tractato I+ aurantiaco (Lugol),
35-40 x 8-10 ltffi, 8-spori. Ascosporae 1-
septatae, 9-11, x 3.5-4 Ffr, primum hyalinae,
postea fuscae. Hymenium 40-50 pm altum,
gelatina I+ caerulea. Pycnidia frequentia, im
mersa ad marginem infectionis, cum parietibus
fuscis. Conidia circiter 3 x 1 pm.
Type: Denmark, East Jutland, Vorso
nature reserve, on Buellia punctata found on
Populus canadensis, tree no. 15, July 1990,
Alstrup (C, holotype). Figure 1.
Pathogenic lichenicolous ascomycete forming
black patches on the host thallus. Ascomata
formed between two horizontal layers of sterile,
brown hyphae, one layer covering the bark
of the host, another layer situated below the
algal layer. The fungal layers are connected by
vertical, brown hyphae. Maturing ascomata
become exposed by breaking through the
upper layer, and merge with neighbouring
ascomata. Asci arthonioid, clavate, apically I-,
rytoplasma I+ orange (Lugol's solution after
K), 35-40 x 8- l0 pm, 8-spored. Ascospores
l.-septate, 9-11 x 3.5-4 Ffr, long remaining
colourles, finally brown. Hymenium 40-50 pm
high, gel I+ blue. Pycnidia frequent, immersed
at the margin of infections, 35-40 1am diam.,
with brown walls. Conidia c. 3 x I pm.