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

THE GENUS SCHISTIDIUM IN HUNGARY 69
From S. rivulare (which has not yet been found in Hungary – Fig. 28), it can be distinguished
by gametophytic characters, e.g. the entire leaf margins (except at apex – compare
Figs 27C and 28B) and the more shallowly keeled, symmetric leaves (sharply keeled
and often asymmetrically secund in S. rivulare: Fig. 28A), and sporophytic characters, particularly
the patterns of exothecial cells and seta surface cells (exothecial cells isodiametric
and incrassate in S. rivulare: Fig. 28D, E), shortly elongate and rather thin-walled in
S. platyphyllum (Fig. 27F); seta surface cells ± strongly elongate, incrassate in S. rivulare
(Fig. 28F), shortly elongate to isodiametric and rather thin-walled in S. platyphyllum:
Fig. 27G), and by the absence of stomata.
Habitat: In Scandinavia S. platyphyllum grows on base-rich or calcareous rocks in or
beside streams (rarely submerged), occasionally in fissures of irrigated ledges and cliffs in
the mountains, or on regularly inundated sea- or lake-shore boulders (BLOM 1998,
WEIBULL 2006). In NW Germany it was found mainly on siliceous blocks at the rivers Elbe,
Weser, Ems, Rhine and some of their tributaries (MEINUNGER and SCHRÖDER 2007). The
Hungarian habitat on block edging at the banks of the Danube corresponds to the German
type of lowland habitat on river banks.
: 100 m a.s.l.
: In Hungary at present known from a single collection.
Distribution of Schistidium platyphyllum
: Comit. Pest. In saxis irrigatis
Danubii ad urb. Szentendre, 100 m, 11.08.1994, leg. B. Papp and M. Rajczy (sub S. rivulare),
rev. P. Erzberger 2007, conf. W. Schröder 2007, BP 163340.
The plants conserved in this specimen were growing on stones in the inundation area
at the Danube in the small island “Pap-sziget“ near Szentendre (B. Papp, ex verbis). A recent
search of the site and of similar places near Szentendre and in the Danube valley
between Szob and Vác by the first author was unsuccessful.
Studia bot. hung. 39, 2008