Additions to the lichen flora of Finland. II. Calcareous rocks and ...

20 Juha Pykälä GRAPHIS SCRIPTA 19 (2007)
300 µm. B. parmigerella has a green – blue green
thallus and the size of the involucrellum is 100–
150 µm. However, in the Lohja material of B.
baldensis the involucrellum size varied between
130–300 µm. No spores were found in the
Finnish material. Apparently spore formation of
the species is rare in Finland, if it occurs at all.
Therefore, B. baldensis disperses poorly to
worked rock surface. Furthermore, other factors
such as poor establishment of the species on
worked surfaces may also be putative
explanations for the general lack of the species in
lime quarries. Only one population was found on
rock surface exposed after mining. The species
occurred c. 10–30 centimetres from the edge of
the mined rock, and probably dispersed
vegetatively to the mined rock. Because of its
poor spore formation B. baldensis has probably
clearly declined due to mining of calcareous
rocks. The overgrowth of rocks by bryophytes
may also be a problem for the species, because
populations of B. baldensis are often surrounded
by empty pits on rocks beneath bryophytes.
Specimens examined: 14 localities in Lohja, first
collection: Hermala, Tolpoonkallio, 60°13'N,
23°50'E, 18.VI.1996, 16845. Varsinais-Suomi:
Karjalohja, Niku, Pyöli, 60°12'N, 23°49'E,
6.VII.2004, 24976; Karjalohja, Karkali, E of
Karkali nature reserve, 60°14'N, 23°50'E,
19.X.2004, 26094; Nummi-Pusula, Pusula,
Kalkkimäki, 60°28'N, 24°00'E, 14.X.2004,
26033, 26039.
Type specimens of Verrucaria pycnosticta Vain.
(Vainio 1921) (Varsinais-Suomi, Särkisalo,
Kaukasalo, 1920, E. Vainio (TUR-V)) are
considered to belong to B. baldensis. They have
radiating ostioles, and they look similar to B.
baldensis. No spores were found in the type
material. According to the protologue (Vainio
1921) the size of the spores of V. pycnosticta is
6–10 × 5–6 µm and Vainio described them as
scarce and not well developed. The spore size
given by Vainio is apparently erroneous. Vainio
also assigned a specimen from Norway (1910 J.
J. Havaas, TUR-V) to V. pycnosticta. According
to Vainio's annotation label no spores were found
in the Norwegian specimen. This specimen also
belongs to B. baldensis.
Bagliettoa parmigerella (Zahlbr.) Vĕzda & Poelt
New to Finland. B. parmigerella occurs in central
and southern Europe and Asia and in
Fennoscandia it has been collected a few times
from Gotland (Halda 2003). In Lohja B.
parmigerella occurs in habitats similar to those
occupied by B. baldensis, but is a rarer species.
No spores were found in the Finnish material. In
Ojamo lime quarry only rock exposed after
mining appears to be available. However, it is
uncertain that the small population (c. 10 cm 2 ) of
B. parmigerella has originated by recent spore
dispersal. It is also possible that the species has
persisted on rock despite the mining process.
Specimens examined: Ojamo, Liessaari, on NWfacing
wall of calcareous rock, 60°14'N, 24°01'E,
22.IV.2003, 22632, 15.IV.2005, 26523; Hermala,
Kalkkimäki, on small flat calcareous rock and on
c. 0.7 m high SE-facing rock wall of calcareous
rock, 60°13'N, 23°51'E, 29.VIII.2003, 23492,
19.VII.2004, 25132; Lylyinen, Sääksniemi, on
small rather flat calcareous rock, 60°15'N,
23°58'E, 16.IX.2003, 23701; Ojamo, Ojamo lime
quarry, open SW slope, very scarce, 60°14'N,
24°02'E, 15.XI.2003, 24085; Paavola,
Rautaniemi, on calcareous stones, 60°13'N,
23°54'E, 21.V.2005, 26870, 26881.
Diplotomma lutosum
New to Finland. D. lutosum is a rare species in
Fennoscandia, occurring mainly on calcareous
rock walls in open situations (Nordin 2000).
Specimen examined: Lohja, Pitkäniemi industrial
area, 5 m from shore of lake Lohjanjärvi,
deciduous forest, lime-influenced quartz-feldspar
gneissic rock, on overhanging W-facing rock
wall, 60°15'N, 24°02'E, 19.VIII.2005, 27634, det.
A. Nordin 2006.