Part 2, 1913] DICRANACEAE 109 
9. DICRANOLOMA Ren. Rev. Bryol. 28: 85. 1901. 
Leucoloma § Dicranoloma Ren. Prodr. Fl. Bryol. Madag. 61. 1897. 
Dioicous, Leaves with a hyaline margin of narrow cells, this margin rarely indistinct, 
or lacking; cells of the leaf-blade not dimorphous, elongate, with somewhat thickened, sinuous 
and pitted walls; dorsal papillae none or scarcely evident; costa nearly percurrent or excurrent; 
alar cells distinct, more or less subhexagonal. Capsule generally curved (erect and symmetric 
in a few species); peristome-teeth split to the middle or below. Calyptra cucullate, extending 
well below the base of the capsule. 
Type species, Dicranum platyloma Besch. 
1. Dicranoloma meteorioides R. S. Williams, Contr. U. S. Nat. 
Herb. 16: 23. 1912. 
Apparently dioicous: plants in lax pendent tufts, with flexuous, somewhat branching 
stems up to 30 cm. long: leaves distant, three-ranked, 9-10 mm. long, 1 mm. wide a little above 
the base, spreading-flexuous, often spirally twisted above, distinctly serrulate three fourths 
of the way down the margin or more, from an ovate base gradually narrowed to a slender, 
lanceolate, keeled point, with costa short-excurrent; costa just above the colored base of the 
leaf 60-70 » wide, stnooth throughout, in cross-section near the middle showing about 4 guide- 
cells with thin stereid-bands on either side; alar cells brown, extending to the costa, about 20 » 
wide and from square to twice as long as wide, often with somewhat thickened walls; cells 
throughout the rest of the leaf mostly elongate, with thickened more or less sinuous and pitted 
walls, the median cells 8-10 4 wide and 12-20 long; perichaetial leaves costate, the inner 
three or four from a convolute base, mostly abruptly narrowed to a serrulate, setaceous, erect 
point 3-4 mm. long, inclosing 8-10 archegonia without paraphyses: seta smooth, 12-14 mm. 
long: calyptra (from a very immature capsule) slightly rough above. 
TYPE LOcALITy: Humid forest between Alto de las Palmas and top of the Cerro de la Horqueta, 
Chiriqui, Panama, alt. 2100-2268 meters. 
DistRIBUTION: Known only from the type locality. 
The specimens, pendent from branches of trees and shrubs, are in very immature fruit. The 
generic position of this species is somewhat doubtful, as Dr. Brotherus has pointed out; he has 
suggested that it might better be placed under Schliephackea. I leave it as it is awaiting more 
complete material; it is a much stouter plant than the single species of Schliephackea known, with 
upper leaf-cells relatively shorter and broader and cell-walls thicker and more pitted, about as found 
in various species of Dicranoloma. 
10. LEUCOLOMA Brid. Bryol. Univ. 2: 218. 1827. 
Dicranum § Leucoloma C. Mill. Syn. 1: 352. 1848. 
Poecilophyllum Mitt. Jour. Linn. Soc. 12:92. 1869. 
Dioicous. Plants growing in pale- to dark-green, mostly soft, not very compact, often 
extensive mats; stems without radicles, usually dark-colored and often rough by the slightly 
projecting bases of the more or less deciduous leaves. Leaves somewhat curved-secund or 
spreading-flexuous, rarely circinate, mostly lanceolate-subulate, subtubulose, grooved above, 
the borders flat or slightly incurved and mostly entire except at the apex; upper leaf-cells, 
except the very narrow border cells, mostly roughened on the back with crowded, sometimes 
compound papillae, the marginal cells pale, much elongate, forming a distinct border, narrow 
above, gradually wider near the middle, often indistinct near the base of the leaf, the upper cells 
of the blade within mostly green and short (all elongate in L. Mariez), and the short cells extend- 
ing along the costa as a broad band nearly to the base of the leaf or gradually becoming elongate 
below and not distinct from the other cells; alar cells large, sometimes forming auricles, from 
hyaline to mostly brownish; perichaetial leaves from a short, broad, sheathing base abruptly 
narrowed to a subulate point. Seta erect. Capsule nearly or quite symmetric, erect, mostly 
cylindric, the lid with a long slender beak; annulus wanting; peristome-teeth divided to the 
middle or to near the base intotwo forks. Calyptra mostly rough above, the base nearly entire, 
sometimes irregularly slit. Growing on decayed logs, sometimes on earth. 
Type species, Leucoloma serrulatum Brid. 
