Additions to the lichen flora of Finland. IV

24 Juha Pykälä GRAPHIS SCRIPTA 22 (2010)
Lohjanjärvi, 60°14′N, 23°48′E, 15.X.2008,
34176.
Verrucaria rimosella Nyl.
New to Fennoscandia. Description based on the
Finnish specimen: thallus white and thinly
epilithic; perithecia 0.25−0.4 mm diam.,
1/2(−3/4)-immersed: involucrellum apical;
exciple dark; spores (13−)15−19(−20) ×
8−10(−11) µm. The present specimen seems to
match the type specimen of V. rimosella (Paris,
Meudon, 1855, W. Nylander, H-NYL).
According to Nylander (1896) the spore size of
V. rimosella is 16−18 × 8−9 µm. V. rimosella is
close to V. schindleri and V. epilithea (which
may be conspecific). In these species the majority
of spores usually exceed 20 µm. Breuss (2007)
gives 19−25 × 9−12 µm as size of spores of V.
schindleri. However, it is possible that V.
epilithea (V. schindleri) should be included in V.
rimosella. Here these species are treated
separately based on the spore size.
Specimen examined: Varsinais-Suomi:
Västanfjärd, Vesterillo, Illogruvan, flat
calcareous rock, on pebble, 60°01′N, 22°42′E,
23.VII.2008, 33166.
Verrucaria rufofuscella Servít
New to Fennoscandia. Description based on the
Finnish specimen: thallus areolate and greenish
brown; areoles 0.2−0.4 mm diam.; perithecia
0.2−0.25(−0.3) mm diam., 3/4-immersed;
involucrellum thin, to the base of the exciple;
exciple dark; spores (18−)20−25 × 10−12 µm.
Perithecia and thallus areoles are smaller than
according to Breuss (2007). V. rufofuscella is a
species of siliceous rocks previously known from
Germany and California (Breuss 2007). V.
endocarpoides has immersed perithecia and
narrower spores. V. nigrofusca has thicker
involucrellum and smaller spores. V.
fuscoatroides has thicker involucrellum and
longer spores. Furthermore, some material have
been studied collected from southern Finland that
represent species morphologically rather close to
these four species, but differing from the
descriptions of these species. They probably
belong to unidentified species.
Specimen examined: Varsinais-Suomi: Karjalohja,
Karkali, Karkali strict nature reserve,
quartz-feldspar gneiss rock on shore of lake
Lohjanjärvi, SW-slope, on pebble, 60°14′N,
23°47′E, 25.X.2008, 34207.
Verrucaria trabicola Arnold ex Servít
New to Fennoscandia. Description based on the
Finnish specimens: thallus subgelatinous, grey,
brown or green, usually pale; perithecia
0.2−0.25(−0.3) mm diam., 1/2−3/4-immersed,
mostly covered by thallus; involucrellum thin,
appressed to and extending to base of exciple,
often diverging at base; exciple usually pale, but
sometimes dark in few mature perithecia; spore
17−25 × 8−11 µm. All finds are from lakeshores.
The species grows on exposed roots, rarely on
bases of deciduous trees, usually on Alnus
glutinosa. The microhabitat is similar to several
other pyrenocarpous species. The species has
been collected growing with Agonimia allobata,
Anisomeridium carinthiacum, Verrucaria
sorbinea and V. cf. hegetschweileri. V. trabicola
was previously known from two collections from
Switzerland and Arizona (Breuss 2007). V.
trabicola is rather similar to V. lignicola
Zschacke (Pykälä & Breuss 2009). The spores of
V. lignicola are 15−19 × 7−9 µm (Breuss 1998).
Furthermore, V. trabicola may in habitus
resemble V. hydrela, which has a spreading
involucrellum.
Specimens examined: Varsinais-Suomi: Lohja,
Paavola, Huhtasaari, shore of lake Lohjanjärvi,
on base of Alnus glutinosa, 60°13′N, 23°56′E,
15.VIII.2006, 29214; Lohja, Hiittinen, Kotniemi,
stony shore of lake Hormajärvi, on strongly
leaning almost horizontal trunk of Betula
pubescens, 60°17′N, 24°01′E, 24.VIII.2006,
29294b; Lohja, Ojamo, Porla, W shore of lake
Lohjanjärvi, on exposed root of Betula, 60°14′N,
24°02′E, 22.III.2007, 30392; Lohja, Ojamo,