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

24 Juha Pykälä GRAPHIS SCRIPTA 19 (2007)
Thelidium incavatum
New to Finland. T. incavatum is a species of
calcareous rocks, stones and pebbles occurring
usually close to the ground (Fröberg 1989,
Foucard 2001). In Lohja the species occurs both
on sun-exposed and shady calcareous rocks and
pebbles.
Specimens examined: Lohja, Tytyri, lime quarry,
on pebbles and on a small rock wall, 60°16'N,
24°04'E, 24.V.2003, 22861b, 8.XI.2003, 24020,
14.1.2005, 26229; Lohja, by the Tytyri lime
processing factory, on a road cutting of
calcareous rock, 60°15'N, 24°04'E, 14.I.2005,
26198; Marttila, on a small flat calcareous rock,
60°14'N, 23°52'E, 21.VI.2005, 27083; Moisio,
Lohjanharju esker, on a calcareous boulder,
60°15'N, 24°06'E, 30.X.2005, 28218, 28219.
Varsinais-Suomi: Karjalohja, Pyöli, on a very
gently SW-facing almost flat calcareous rock,
60°12'N, 23°48'E, 6.VII.2004, 24956, 24965.
Uusimaa: Helsinki, Vuosaari, Kalkkisaari, on
wall of lime quarry, and on pebbles, 60°13'N,
25°11'E, 20.IX.2005, 27934, 27944, 27956.
Thelidium olivaceum (Fr.) Körb.
New to Fennoscandia. T. olivaceum is a
circumboreal species, which is most frequent in
the central and southern European mountains
(Nimis 1993). The nearest sites to Finland are in
Latvia (Lichen flora of Latvia) and Denmark
(Søchting & Alstrup 2002). The T. olivaceum
material from Lohja has a thin, brown thallus,
small 1/4–3/4-immersed perithecia (0.15–0.3
mm), and the spores are (0–)1-septate and 15–22
× (5–)6–9 µm in size. The involucrellum often
reaches to the base of the perithecia, and the
exciple is pale. The characters of the collections
of Lohja fit well with the description of T.
olivaceum by Zschacke (1933). According to
Wirth (1995), the spores of T. olivaceum tend to
be broader: 16–22(–34) × 7–12(–14) µm.
Specimens examined: Lohja-Pappila, Tytyri, lime
quarry, on calcareous stones, 60°16'N, 24°04'E,
7.X. 2000, 20045, 24.V.2003, 22848, 22850;
Lohja, Pitkäniemi, shore of lake Lohjanjärvi,
60°15'N, 24°02'E, 19.VIII.2005, on a flat
calcareous rock, 27563, and on a NW-facing rock
wall, 27598.
Thelidium pyrenophorum
New to Finland. T. pyrenophorum is a
circumboreal species (Nimis 1993), which is
widely distributed on calcareous rocks of Sweden
and occurs in all biogeographical provinces
(Santesson et al. 2004).
Specimen examined: Ojamo, Kalkkisaari, shore
of lake Lohjanjärvi, near the top of a SW-facing
calcareous rock in a rather sun-exposed
microhabitat, 60°14'N, 24°01'E, 31.III.2005,
26415.
Thelidium zwackhii
New to Finland. T. zwackhii is a pioneer species
of calcareous soils and rocks. In Tytyri it grew on
quarry waste soil shaded by young deciduous
trees and in an open area dumped with soil c. 10
years ago.
Specimens examined: Isoteutari, Pyttberget,
dump, on calcareous soil, 60°09'N, 23°59'E,
17.VIII.2003, 23387, 23388, this locality was
destroyed in 2004; Lohja-Pappila, Tytyri lime
quarry, on quarry waste soil, 60°16'N,
24°04'E,15.V.2004, 24665, 20.IV.2005, 26621,
26775; Kirkonkylä, N of Virkkala church, in
gravel pit enriched by calciferous dust, 60°11'N,
24°00'E, 20.VII.2004, 25167; Paloniemi,
Luhtalahti, on road bank by calcareous rock,
60°16'N, 24°01'E, 28.IV.2005, 26704.
Verrucaria caerulea
New to Finland. V. caerulea is a widely
distributed species of calcareous rocks, which
was found on sun-exposed to half-shady dry
calcareous rocks and lime quarries. It was also
collected from a mortar wall and from cement.
All populations were small. In Öland the species
also occurs in shaded and moist habitats (Fröberg
1989).