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

THE GENUS SCHISTIDIUM IN HUNGARY 77
Exothecial cells thin-walled, predominantly oblong; stomata absent; hairpoint
short or absent, 0–0.3 mm, smooth or finely spinulose- denticulate;
capsule-bearing branches not in fascicles; leaves 1.4–2.3 × 0.5–1.0 mm,
obtusely keeled, symmetric, margins entire or irregularly denticulate
immediately below apex
subsp.
(base-rich rocks in or beside
rivers or streams, rarely submerged)
Peristome absent or rudimentary (< 25 μm), stomata 3–6 per urn;
hair-point usually long, finely denticulate; perichaetial leaves plicate;
operculum mamillate; plants small to medium-sized
(siliceous rocks)
Peristome perfect, stomata 3–10 per urn; hair-point short or long,
coarsely spinulose; operculum rostrate, but rostrum sometimes short;
plants small
Hair-point short, 0–0.45 mm, fine, flattened and mostly broadened towards
insertion; peristome teeth strongly and irregularly perforated,
pattern of exothecial cells not very irregular, stomata small, 3–8 per
urn
(exposed siliceous or base-rich rocks)
Hair-point usually long, 0–0.8 mm, coarse, terete and narrow throughout,
not or shortly and narrowly decurrent, in young leaves strongly
spinulose with some very long spines (22–30(–75) μm); peristome
teeth almost entire or narrowly perforated in 1(2) rows, exothecial
cells forming an irregular pattern; stomata 6–8(10) per urn
S. spinosum (exposed siliceous rocks)
Leaf margin or dorsal side of costa in upper half of leaf with papillae or
projecting cells (denticulate)
Leaf margin and dorsal side of costa smooth (few papillae may occur at
leaf apex immediately below the hair-point, in S. dupretii also further
down)
Studia bot. hung. 39, 2008