B. Papp szerk.: Studia Botanica Hungarica 39. 2008 (Budapest, 2008)

Erzberger, P.; Schröder, W.: The genus Schistidium (Grimmiaceae, Musci) in Hungary

17a Stomata present; plants on siliceous substrate; hair-point flat and fine, short; exothecial cells in mid-urn 20-42 pm long S. confertum (exposed siliceous or base-rich rocks) 17b Stomata absent; plants of calcareous rocks; hair-point coarse, well developed in perichaetial leaves, often absent or short in normal leaves; exothecial cells up to 50-80 pm long, forming a regular pattern S. brunnescens (dry, exposed calcareous rocks) aa) Leaves ovate-lanceolate to ovate-triangular, often with shoulders, 1.85-2.6 mm, usually with longitudinal ridge-like striae on one or both sides of costa; costa 58-90 urn wide in central part of leaf S. brunnescens subsp. griseum bb) Leaves oblong, ovate or short ovate-triangular, 1.1-2.0 mm; shoulders and longitudinal ridge-like striae absent; costa 38-60 urn in central part of leaf S. brunnescens subsp. brunnescens 18a Urn with 6-10 stomata; leaves acuminate; hair-point usually conspicuous, 0.3-1 mm 19 18b Urn with 0-4 stomata; leaves not acuminate; hair-point conspicuous or less than 0.2 mm 20 19a Central strand absent, urn usually ovate in shape, with 6-8(-l6) stomata; exothecial cells with hardly incrassate longitudinal walls; hairpoint of normal leaves terete at base, not decurrent; upper lamina cells isodiametric, not sinuose, not distinctly incrassate; lamina with irregular bistratose patches S. elegantulum (shaded calcareous rocks) aa) Hair-point broad, very finely but densely spinulose with only slightly protruding spinulae (appearing smooth with a hand lens); peristome teeth straight, patent to squarrose; costa in lower part of leaf 75-88 ^.m wide, 5-7 stratose; plants forming tufts; stomata 8-16 per urn S. elegantulum subsp. wilsonii bb) Hair-point narrow, distantly spinulose with longer spinulae (visible with a hand lens); peristome teeth curved, erect to erecto-patent with tips curved inward; costa in lower part 53-78 urn wide, 4-5 stratose; plants forming mats or decumbent tufts; stomata 6-8 per urn S. elegantulum subsp. elegantulum 19b Central strand always distinct (> 20 cells); urn usually cylindrical in shape, with 8-10 stomata; exothecial cells with irregularly thickened longitudinal walls; hair-point usually flattened at base, decurrent; upper lamina cells sinuose, incrassate, bright yellowish, especially in lower lamina distinctly incrassate and sinuose; lamina rarely with bistratose patches S. robustum (calcareous rocks)