Atrichum undulatum

SPECIES

1. KingdomPlantae
2. PhylumBryophyta
3. ClassPolytrichopsida
4. OrderPolytrichales
5. FamilyPolytrichaceae

Observations recorded134,439

Plants small to fairly large, dark green. Stems 2-5 cm. Leaves sparse below, more crowded above, 4-9 × 0.8-1.5 mm, lingulate to lanceolate, undulate, keeled distally, concave to flat proximally, with oblique rows of abaxial teeth on undulations, the apex acute; costa percurrent, with teeth on abaxial surface in distal half; lamellae 2-6, 2-4(-7) cells high; median leaf cells 20-32 µm wide, irregularly angled to hexagonal, sometimes rounded, often transversely elongate, convex on both surfaces, smooth or with minute, verrucose or striate papillae on abaxial surface, walls firm, strongly collenchymatous with trigones. Sexual condition polygamous, some shoots bisexual, others apparently male or female; perigonial bracts broad, forming antheridial buds, often several buds per plant. Seta 1(-3) per perichaetium, 1-3 cm, reddish brown. Capsule 2-4(-8) × 0.5-1 mm, curved to distinctly arcuate, almost horizontal; operculum 2-3 mm. Spores (12-)16-28 µm.

via GBIF · IUCN