Plagiothecium lamprostachys (Hampe) A.Jaeger, Bericht ueber die Thaetigkeit der St. Gallischen Naturwissenschaftlichen Gesellschaft 1876-1877: 449 (1878)

Wolski, Grzegorz J., Latoszewski, Mikolaj, Cargill, D. Christine & Buck, William R., 2024, Re-assessment of type material of Plagiothecium novae-seelandiae Broth. and descriptions of four new Plagiothecium taxa (Bryophyta, Plagiotheciaceae) from Australasia, PhytoKeys 238, pp. 95-117 : 95

Plagiothecium lamprostachys (Hampe) A.Jaeger, Bericht ueber die Thaetigkeit der St. Gallischen Naturwissenschaftlichen Gesellschaft 1876-1877: 449 (1878)

Hypnum lamprostachys Hampe, Linnaea 30: 639 (1860).

Type.

Australia, Hab. ad fl. Tarwin. Lectotype (selected by Ochyra 2002): Austral felix Tarwin, Herb. Hamp. - 1881. Hypnum lamprostachys Hpe. leg. F. Mueller N °59, 1855 (BM-Hampe!). Isolectotypes: (BM000677526!, BM000677527!, BM000677528!, NY322494!) .

Description.

Plants medium size, yellowish to yellow-green, with metallic luster, forming dense mats; stems 1.5-2.5 cm long, in cross-section rounded, the central strand well-developed; leaves asymmetrical to almost asymmetrical, ovate, concave, rather imbricate and closely arranged on the stem, those leaves from the middle of stem 2.5-2.6 mm long and the width measured at the widest point 1.1-1.2 mm (Fig. 3 ); the apex acute, entire, not denticulate; costae two, extending usually to 1/2 of the leaf length; laminal cells more or less symmetrical, arranged in fairly even rows, 140-150 × 12-13 μm in the middle of leaves; due to the wide cells, cell areolation loose; decurrency of 4 rows of rounded and inflated cells, forming distinct auricles, 200-250 μm long; sporophytes so far unknown; sexual condition unknown.

Plagiothecium lamprostachys type material was recorded near the Tarwin River in Australia ( Hampe 1860).

Figures

Figure 3. Selected taxonomic features of P. lamprostachys A shape and dimensions of the leaf B leaf apex C cells from the middle part of the leaf D leaf basal cells (from the type of material of H. lamprostachys BM 000677528!, photo. G. J. Wolski, 01 August 2023).