Schistidium atrofuscum (Schimp.) Limpr.

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 : 49-52

1. Schistidium atrofuscum (Schimp.) Limpr.

( Fig. 3)

Die Laubmoose Deutschlands, Oesterreichs und der Schweiz 1: 713

(1889). — Grimmia atrofusca Schimp., Syn. musc.eur., ed.2: 240 (1876).

Schistidium apocarpum var. atrofuscum (Schimp.) C.E.O. Jens. ex Weim., Förteckning öfer Skandinaviens Växter, Mossor ed. 2, 2: M28 (1937).

HABITAT. — Exposed calcareous rocks, from 1100 to 2000 m. Distribution: Figure 4. This species was known from very few provinces of Spain, and in the south it had only been cited from Jaén.

DESCRIPTION

Plants

Small, 0.7-1(1.5) cm long, forming dense and pulvinate tufts, jet-black. Leaves straight, erect, imbricate, triangular-ovate to ovate-lanceolate, obtuse to subacute, 0.9-1.6 × 0.3-0.5 mm.

Hair-point

Absent or rarely present as a very short and finely denticulate tip, to 0.15 mm long, not very wide at insertion.

Lamina smooth, in upper and central part mostly 2-stratose to 1-stratose; margins plane in upper part, recurved in lower ½-⅔, 2-stratose in upper and central part.

Laminal cells

In upper and central part isodiametric to short oblong, not or slightly sinuose, mixed with oblate cells, 6-12 µm long, basal cells esinuose, 15-40 × 8-10 µm.

Perichaetial leaves

Elliptical to lingulate, 2-3.5 × 0.4-0.6 mm.

Urn shortly oblong, sometimes cyathiform, 0.7-0.9(1) × 0.5-0.7 mm, orange to yellowish.

Exothecial cells

Predominantly rectangular, mixed with groups of short rectangular or isodiametric cells, stomata absent.

Peristome teeth

60-250(300) µm long, sometimes very short to rudimentary, entire to semi-perforated in upper and central part, orange-red to yellowish.