THE GENUS SCHISTIDIUM (GRIMMIACEAE, MUSCI) IN HUNGARY ...

78 ERZBERGER, P. and SCHRÖDER, W.
Exothecial cells in central part of urn predominantly oblong, up to
60 μm; peristome teeth 300–450 μm long, in freshly deoperculate capsules
stellate-straight, scarcely twisted, orange; hair-point coarse, of
variable length; urn usually with 0–4(6) stomata at base, but sometimes
more, pores rudimentary or lacking; central strand distinct (> 6 cells);
spores 8–11 μm
(calcareous rocks, often on concrete)
Exothecial cells predominantly isodiametric and transversely elongate;
peristome teeth 300–710 μm long, strongly curved, bent clockwise
and twisted; stomata with distinct pores present; hair-point fine,
of variable length; central strand absent or narrow (< 6 cells); spores
(9)11–15(19) μm
Peristome teeth forming a dome above the urn mouth, (410)450–700 μm
long, very finely and longly pointed, red; columella not falling with the
lid; plants often black, hair-point absent or short (0–0.18 mm)
S. trichodon (moist calcareous rocks)
) urn never cyathiform, length / width ratio 1.6–2.4, plants brownish, never
jet-black
S. trichodon var. nutans
) urn often cyathiform, length / width ratio 1.3–2.1, plants often jet-black
S. trichodon var. trichodon
Peristome teeth reflexed or spreading, 320–710 μm long, their points
may be bent upwards, but never form a dome, red-orange; columella
falling with the lid
Urn 0.7–1.0 mm long and 0.5–0.65 mm wide, exothecial cells quadrate
to transversely rectangular, in regular perpendicular rows, peristome
teeth 320–400 μm; costa strongly papillose on abaxial side in upper
half of leaf, papillae increasing in length towards leaf apex (up to 9–11
μm high), leaf margin strongly and irregularly denticulate to serrate in
upper part of leaf; perichaetial leaves 0.5–0.8 mm wide, small plants
(shaded siliceous, rarely calcareous rocks)
Urn 0.9–1.35 mm long and 0.5–0.85 mm wide, exothecial cells isodiametric,
but pattern less regular; peristome teeth 400–700 μm; leaf margin
finely denticulate or rarely smooth, costal papillae lower; perichaetial
leaves 0.8–1.5 mm wide, medium-sized plants
(calcareous or siliceous substrata)
Studia bot. hung. 39, 2008