Acroporium longirostre (Brid.) W.R.Buck
-
Authority
Buck, William R. 1998. Pleurocarpous mosses of the West Indies. Mem. New York Bot. Gard. 82: 1-400.
-
Family
Sematophyllaceae
-
Scientific Name
-
Description
Species Description - Plants small to medium-sized, in mostly lustrous, ± soft, golden, compact mats. Stems creeping, to ca. 2 cm long, freely but irregularly branched, the branches ± ascending, short, indistinctly cuspidate; in cross-section with 2-3 rows of small thick-walled colored cells surrounding large firm-walled cells, central strand absent; pseudoparaphyllia foliose; axillary hairs with a single rectangular brown basal cell and 2 elongate hyaline distal cells. Stem and branch leaves similar, erect to erect-spreading, subsec-und, linear-lanceolate to lanceolate, 1.02-1.4 X 0.11-0.24 mm, gradually acuminate, concave; margins entire or minutely serrulate above, mostly incurved above; costa short and double or absent; cells linear, subflexuose, smooth or rarely unipapillose, thick-walled, porose, becoming yellow and very porose toward the insertion; alar cells 2 in each basal angle, ± curved to the insertion, greatly enlarged and inflated, yellow to hyaline, oval to oblong. Asexual propagula none. Autoicous. Perichaetia inconspicuous, on stems and bases of branches; leaves erect, lanceolate, ca. 1.3 mm long, acuminate; margins eróse to serrate above, subentire below, plane; costa mostly none; cells linear-flexuose, smooth, thick-walled, porose, becoming shorter and broader toward the insertion; alar cells not differentiated. Setae elongate, very slender, smooth, orange-red, 0.6-0.8(-l) cm long, curved just below the urn or not; capsules suberect to inclined, small, ± asymmetric, short-cylindric, 0.4-0.8 mm long; exothecial cells subquadrate to short-rectangular, strongly collenchymatous, becoming oblate and evenly thin-walled in 2-3 rows at the mouth; annulus not differentiated; operculum obliquely and slenderly long-rostrate, 0.8-1 mm long, longer than the urn; exostome teeth triangular, yellowish, shouldered, bordered, on the front surface with a ± broad median furrow, cross-striolate below, coarsely papillose above, trabeculate at back; endostome with a high basal membrane, segments coarsely papillose, narrow, keeled, perforate, shorter than the teeth, cilia short and single or rudimentary. Spores spherical, finely papillose, 13-16 pan diam. Calyptrae cucullate, naked, roughened at the extreme apex.
-
Discussion
3. Acroporium longirostre (Brid.) W. R. Buck, Brittonia 35: 311. 1983; Leskea longirostris Brid., Bryol. Univ. 2: 311. 1827; Aptychus longirostris (Brid.) Müll. Hal., Hedwigia 37: 256. 1898; Rhaphidostegium longirostre (Brid.) Broth, in Engl. & Prantl, Nat. Pflanzenfam. 1(3): 1112. 1908; Sematophyllum longirostre (Brid.) Broth, in Engl., Nat. Pflanzenfam., ed. 2, 11: 433. 1925. Plate 145, figures 1-7 Hypnum liliputianum Mont, in Sagra, Hist. Phys. Cuba, Bot. Pl. Cell. 528. 1842; Sematophyllum liliputianum (Mont.) Mitt., J. Linn. Soc., Bot. 12: 488. 1869; Rhaphidostegium liliputianum (Mont.) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876-77: 402. 1878; Rhaphidorrhynchium liliputianum (Mont.) Broth, in Engl., Nat. Pflanzenfam., ed. 2, 11: 427. 1925. Sematophyllum sericifolium Mitt., J. Linn. Soc., Bot. 12: 483. 1869; Rhaphidostegium sericifolium (Mitt.) A. Jaeger, Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876-77: 394. 1878. Discussion. Most closely related to Acroporium caespitosum, A. longirostre may be distinguished from that species by the narrower, subsecund leaves with fewer alar cells. The branch apices are not strikingly cuspidate as in many members of the genus, but the narrow leaves with greatly enlarged alar cells and furrowed exostome teeth clearly place the species in Acroporium. A single specimen from Puerto Rico (Buck 3754, NY) has papillose leaf cells, but otherwise is like typical material. This form might be misidentified as Trichosteleum vincentinum, but can be told from that species by the larger alar cells and smooth seta.
-
Distribution
Range. Central America; Cuba, Jamaica, Hispaniola (Dominican Republic), Puerto Rico, St. Eustatius, Guadeloupe, Dominica, Martinique, St. Lucia, Grenada; growing on bases of tree or more commonly on rotten logs, usually in moist forests, from near sea level to 1650 m, but most common below 500 m.
Central America| Cuba South America| Jamaica South America| Dominican Republic South America| Puerto Rico South America| Sint Eustatius South America| Guadeloupe South America| Dominica South America| Martinique South America| Saint Lucia South America| Grenada South America|