Schistidium flaccidum (De Not.) Ochyra, 1989

Guerra, Juan, Cano, María J., Martínez, Mónica, Jiménez, Juan A. & Gallego, M. Teresa, 2021, Schistidium apocarpum complex (Grimmiaceae, Bryophyta) in the Baetic Mountain Ranges, southern Iberian Peninsula, Cryptogamie, Bryologie 20 (5), pp. 45-71 : 68

9. Schistidium flaccidum (De Not.) Ochyra

( Fig. 17)

Nova Hedwigia 48: 94 (1989). — Anictangium flaccidum De Not. ,

Memorie della Reale Accademia delle Scienze di Torino 39: 254 (1836).

Schistidium pulvinatum var. flaccidum (De Not.) De Not., Syllabus Muscorum in Italia: 279 (1838).

HABITAT. — Gneiss and mica schists, usually in exposed and sunny places, from 1222 to 3115 m. Distribution: Figure 14. The species is known from various mountain ranges in the northern, central and southern parts of the Iberian Peninsula.

DESCRIPTION

Plants

Small to medium-sized, to 1.5 cm long, forming dense and pulvinate cushions, light green to brownish.

Leaves

Straight, erect, imbricate, ovate-lanceolate to triangular-ovate, acute, 1.3-1.7(1.9) × 0.5-0.7 mm.

Hair-point

Flattened, wide at insertion, embracing a portion of the upper lamina, denticulate, flexuose, to 0.75 mm long.

Lamina

Smooth, 1-stratose occasionally with 2-stratose spots or short striae; margins recurved usually on both side of the leaf, 1- to 2-stratose in upper and central part.

Laminal cells

In upper and central part isodiametric to short oblong or oblate, not or slightly sinuose, (5)7-10(12.5) µm long, basal cells esinuose, (17)30-50 × 7.5-10 µm.

Perichaetial leaves

Ovate-lanceolate to oblong-lanceolate, (1.9)2-3 × 0.6-0.8 mm. Urn hemispherical, usually cyathiform, (0.6)0.7-0.9(1) × 0.5- 0.8 mm, orange-brown to light yellowish.

Exothecial cells

Irregular, predominantly rectangular in lower half of urn, stomata 3-6 per urn.

Peristome teeth

Absent or rudimentary, reduced to a short basal segment, orange.