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Zygodon pentastichus

Comprehensive Description

provided by Smithsonian Contributions to Botany
Zygodon pentastichus

Zygodon pentastichus (Mont.) C. Müll., Syn. 1:675, 1849.

Aulacomnium pentastichum Mont., Ann. Sc. Nat. Bot. ser. 3, 4:103, 1845. [Original material: Southern Chile, coll. C. Gay.]

Zygodon uncinatus Mitt., J. Linn. Soc., Bot. 12:234, 1869. [Original material: Chiloe Isl., Chile, coll. Lobb.]

Brownish green plants, with creeping stems giving rise to erect branches 1–2 cm long, branches with terminal perichaetia and frequent innovations. Leaves in 5 distinct ranks, spreading when dry or sharply squarrose-recurved from sheathing base when moist, 3.0–3.5 mm long, 1 mm wide, blade lanceolate with a slenderly acute tip; costa percurrent or subpercurrent; cells of upper lamina ca. 10 μm wide, 10–25 μm long, very thick-walled with lumens rounded to elliptical, surface finely pluripapillose; cells of sheathing base smooth, elongate to 65 μm long, forming streaks consisting of lines of thin-walled, hyaline cells and intervening lines of thick-walled, reddish cells. Dioicous. Setae yellowish, to 10 mm long. Capsule urn ca. 2 mm long. Spores 26 μm in diameter, rough.

MAS AFUERA: Near Camp Correspondencia, 3800 ft, H. & E. 114; Los Innocentes, trail to ca. 3000 ft, H. & E. 248, 581; below summit, ca. 4000 ft, H. & E. 529; 4000–5000 ft, H. & E. 792; south summit, 1300 m, I. 37391, 37416.

The species is known from Juan Fernandez, mainland Chile, Patagonia, and northward to southern Peru. The species is very distinctive and is often placed in a separate genus, Stenomitrium.
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bibliographic citation
Robinson, Harold E. 1975. "The mosses of Juan Fernandez Islands." Smithsonian Contributions to Botany. 1-88. https://doi.org/10.5479/si.0081024X.27