GRAPHIS SCNIPTA - Universitetet i Oslo

GRAPHIS SCRIPTA s (1993) Nordic lichens and lichenicolous fungt 99
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Figure 3. Chionosphaera lichenicola, holotype.
Basidia and basidiespores. Bar 10 pm.
Type: Greenland, Qaanaaq district, 2 km
W of Qaanaaq, alt. 2O m, on dead twigs and
leaves of Cassiope tetragone in Cassiope
dwarf-shrub heath, October L99Z, T. Diklev
(C, holotype). Figure 4.
Thallus indistinct, thin, whitish, thalline margin
distinct around young apothecia. Apothecia
up to 0.4 mm diam., flat to slightly convex,
pale at first, turning brown. Hymenium about
60 pm high, with a faint I+ blue reaction,
paraphyses branched in upper part, often with
enlarged end-cells, which are brown-capped.
Asci broadly ellipsoid, lecanoroid, tholus distinct,
I+ blue, 48-55 x 13- 15 pm, polysporous.
Ascospores 24-32 per ascus, globose, hyaline,
4.5-5.5 pm diam.
The iodine-reaction of the ascus and the
Figure 4. Lecanora polysphaeridia, holotype.
Asci and ascospores. Bar t0 pm.
Figulr 5. Nigropuncta groenlandica, holotype.
Part of conidiophore and conidia. Bar 101nm.
Nigropuncta groenlandica Alstrup, sP.
nov.
771,137 (C, holoq/pe). Figure 5.
o c
thalline exciple places the new species in
Lecanora instead of Biatorella. It belongs to
the Lecanora fuscescens group and is distinct
in being polysporous with globose ascospores.
The new species was found in small
quantities mixed with lapewia tornodnsis,
which is the first lichen to colonize the dead
twigs and leaves of Cassiope teffagone. fapewia
is easily recognized on its red- to dark-brown,
highly convex apothecia.
On even more decayed parts of Cassiope
many lichens, as Lopadiam pezboideum,
Rinodina turfacea and Penusarin dactylina
werd found.
Fungus lichenicola pathogenes parietibus
pycnidiorum fuscis, e cellulis angulatis 7 -I0
;rm diam. formatis, in HNO3 colorem purpurascenter
fuscum trahentibus a N. rugulosa
diversus. Conidia catenata, unicellularia vel
saepe 2-5 congregata,T-8.5 pm diam., membranis
crassis, rugulosis, fuscis, K-, HNO3-.
Typet Greenland, Sukkertoppen district,
Kangerdluarssuk, bay E of settlement, on
unidentified crustose lichen on stones on the
ground, a raised beach, August 1977, Alstrup
A pathogenic lichenicolous fungus differing
from N. rugulosa D. Hawksw. in having darkbrown
pycnidial walls composed of angular
cells 7 -IO pm diam, changing to purplish
brown in nitric acid. Conidia formed in chains,
l-cellular but often adhering in groups of 2-5,