BFNA Title: Catoscopium
Author: D. H. Vitt 
Date: June 3, 2004
Edit Level: R Brum+ 
Version: 1

Bryophyte Flora of North America, Provisional Publication
Missouri Botanical Garden
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Dale H. Vitt


Plants acrocarpous.  Stems erect.  Leaves erect, lanceolate, leaf cells smooth. Seta terminal, slender-elongate, dark red. Capsules small, glossy, black, inclined to horizontal, smooth, ovoid, strongly asymmetric and curved, with mouth pointed downward; stomates none; peristome diplolepidous; endostome segments reduced to a low membrane; exostome teeth 16, short, irregular, fragile.


Genus 1; North Temperate areas.


Catoscopium Bridel, Bryol. Univ. 1: 112.  1826 * the mouth of the capsule is directed downward and hence looks down


Plants erect, cushion forming.  Stems slender with reddish tomentum.  Leaves lanceolate, acuminate, distal laminal cells ± quadrate, smooth, basal cells longer, smooth.  Seta erect, black. Capsule asymmetric, ± inclined, peristome reduced.


Species 1; North America, Europe, Asia.


1. Catoscopium nigritum (Hedwig) Bridel, Bryol. Univ. 1: 368.  1826


Plants to 6 cm high.  Stem leaves erect-spreading, three-ranked, flexuose when dry, 0.8--1.5 mm, lanceolate, acuminate; margins narrowly recurved, entire; distal laminal cells quadrate to short-rectangular, smooth; basal laminal cells oblong to elongate, smooth.  Sexual condition dioicous.  Perichaetial leaves somewhat larger than vegetative leaves.  Seta 8--24 mm. Capsule 0.6--1 mm, small, shiny; urn ovoid, inclined to horizontal; endostome teeth truncate, lanceolate, incurved. Calyptra cucullate.  Spores 33--48 µm.


Confined to small mounds at the edges of pools in calcareous rich fens; low elevations; Greenland; Alta., B.C., Man., N.B., Nfld., N.W.T., Nunavut, Ont., Que., Sask., Yukon; Alaska, Colo., Ind., Iowa, Mich., Minn., Mont., N.Y.


The dense turfs of reddish-black stems with erect, lanceolate leaves characterize this species.  When collections are fertile, the small, shiny, black capsules with small mouth, reduced peristome, and inclined posture clearly define the species.