Tropicos | Name - !Pseudocrossidium replicatum (Taylor) R.H. Zander

Cent. Amer. Moss > Pottiaceae > Pseudocrossidium > Pseudocrossidium replicatum

Choose Project down

English

!Pseudocrossidium replicatum (Taylor) R.H. Zander

Search in Muséum national d'Histoire naturelle

Search in Type Specimen Register of the U.S. National Herbarium

Search in African Plants Database at Geneva Botanical Garden

African Plants, Senckenberg Photo Gallery

Project Name Data (Last Modified On 2/16/2011)

Acceptance : Accepted

Project data (Last Modified On 2/16/2011)

Discussion:

Pseudocrossidium replicatum can usually be recognized when dry with a hand lens by its yellowish green color and spirally appressed leaves. Under the microscope its exceptionally well-developed stem central strand, spirally revolute leaf margins, single (dorsal) stereid band in the costa, massive compound leaf cell papillae, and yellow-orange, long-rectangular inner basal leaf cells will separate it from all other Pottiaceae species. The only other Central America species of Pseudocrossidium, P. austrorevolutum, differs from it in having shorter leaves, and hyaline to green, quadrate to short-rectangular inner basal leaf cells. Pseudocrossidium crinitum (Schultz) Zand. and P. obtusulum (Lindb.) Crum & Anders. are found nearby in Mexico and southern California and may occur in Central America. Pseudocrossidium crinitum differs from P. replicatum in having long-awned leaves, while P. obtusulum differs in having shorter, ovate-deltoid leaves and quadrate, hyaline to green inner basal cells.

Zander (1979, 1993) has in error associated the species name Barbula perlinearis C. Müll. rather than B. perlinealis C. Müll with this species. Barbula perlinearis is a South African species treated by Magill (1981) as an “Insufficiently Known Species.”

Illustrations: Steere (1938, Pl. 88 C); Bartram (1949, Fig. 59 E–G); Zander (1981a, Pl. 4 1–6); Sharp et al. (1994, Fig. 220 a–e); Churchill and Linares (1995, Fig. 158 d–g); Eckel et al. (1997, Fig. 3). Figure 63.

Habitat: On soil, roadside bank, dry bluffs, rocks or adobe walls; 1360–2400 m.

Distribution in Central America: GUATEMALA. Huehuetenango: Sharp 4764 (F, MO, NY); Jalapa: Standley 76707 (F, FH); Quezaltenango: Sharp 1931 (FH, MO); Sacatepéquez: Svihla 2798 (FH); Sololá: Svihla 2887 (FH); Totonicapán: Standley 83157 (F, FH, NY). HONDURAS. Francisco Morazán: Nelson 9067 (MO, TEFH).

World Range: Southwestern and South-Central U.S.A.; Mexico; Central America; Western, Northern, and Southern South America.

Export To PDF

Export To Word

Pseudocrossidium replicatum (Tayl.) Zand., Phytologia 44: 206. 1979.

Barbula replicata Tayl., London J. Bot. 5: 49. 1846. Protologue: Ecuador. On walls, near Quito, Prof. William Jameson, (Dr. Greville’s Herbarium).

Barbula spiralis Schimp. ex C. Müll., Syn. Musc. Frond. 1: 622. 1849. Tortula spiralis (Schimp. ex C. Müll.) Mitt., J. Linn. Soc., Bot. 12: 151. 1869. Protologue: Mexico. Mexico, Yarrea (?) pr. Mirador: Liebmann

Barbula perlinealis C. Müll., Bull. Herb. Boissier 5: 195. 1897. Protologue: Guatemala. Quezaltenango. Coll. [Bernoulli & Cario] N° 118. (FH, NY).

Plants small to medium-sized, yellow-green above, reddish brown below, in tufts, 5–20 mm high. Stems red, not or sparsely branched, sclerodermis weakly present, central strand exceptionally well-developed; rhizoids sparse. Axillary hairs 5–6 cells long, all cells hyaline. Leaves 1.2–2.2 mm long, elliptic to obovate-lanceolate, erect or spreading at base, spirally appressed when dry, spreading to spreading-recurved when wet; apices broadly acute to obtuse-rounded, mucronate; margins spirally revolute to the apex, the interior cells of the revolute margins, thin-walled, weakly papillose, hyaline or green; costa stoutly excurrent as a smooth mucro, densely papillose on upper dorsal surface, guide cells and single (dorsal) stereid band present, ventral surface layer enlarged, thin-walled, papillose; upper and basal cells differentiated, upper cells in regular rows, subquadrate, hexagonal or oblate, 6–10 x 8–10 μm, firm-walled, densely papillose by crowded, compound papillae, outer basal cells subquadrate, to rectangular, firm-walled, smooth, 10–25 x 4–8 μm, hyaline, inner basal cells near costa long-rectangular, firm-walled, smooth, 26–90 x 6–8 μm yellow-orange, alar cells not differentiated. Dioicous. Perichaetia and perigonia terminal; perichaetial leaves not differentiated. Setae smooth, 10–15 mm long, red. Capsules cylindrical, erect, 2–2.5 mm long, smooth; exothecial cells short-rectangular, thin-walled; stomata in neck; opercula slightly inclined, long-rostrate, 0.8–1.5 mm long; annuli of 2–3 layers of small, non-vesiculose cells; peristome yellow-orange, basal membrane high, teeth long, spirally twisted, 0.8–1.0 mm long, densely spiculose. Spores 10–14 μm, smooth or lightly roughened. Calyptrae cucullate, smooth, 2–3 mm long.