Calliergonella

Plants large, yellow-green or brownish. Stems pinnate, subpinnate, or irregularly branched; hyalodermis present, central strand present, sometimes poorly developed; paraphyllia absent; rhizoids arising from ventral stem surface near leaf base, not forming tomentum, commonly branched, smooth; axillary hair distal cells 2–6, hyaline. Stem and branch leaves erect-appressed, straight, dimorphic, ovate or lanceolate, not plicate, 1.8–2.2 mm; base decurrent; margins plane to incurved, entire, limbidia absent; apex usually cuspidate; costa double, short, inconspicuous, or ecostate; alar cells differentiated, inflated, region distinct; medial laminal cells long flexuose-sinuate, 42–115(–145) µm. Sexual condition dioicous. Capsule horizontal, obovoid, arcuate; peristome perfect; exostome teeth bordered; endostome cilia 2–4. Spores 17–22 µm.

Distribution

North America, Mexico, South America, Europe, Asia, n Africa, Atlantic Islands (Iceland), Pacific Islands (New Zealand), Australia, introduced in West Indies.

Discussion

Species 1.

Selected References

Hedenäs, L. 1990. Taxonomic and nomenclatural notes on the genera Calliergonella and Breidleria. Lindbergia 16: 161–168.

Lower Taxa

Calliergonella cuspidata