386 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Leueosarmentum Fulford, gen. nov. 



Alobiella auct. p.p. 



Caules foliosi, e caudice irregulariter ramoso, prostrate Caulium cortex 6-15 

 seriebus, cellulis dorsalibus maioribus. Rhizoidea e basi amphigastriorum. Folia 

 oblique inserta, succuba, bifida. Amphigastria bifida, raro trifida. Inflorescentia 

 masculina terminalis vel intercalaris. Inflorescentia feminea in ramo brevi caudicis, 

 bracteis bracteolisque bifidis. Perianthium 3-carinatum insuper, ore 3-lobato, 

 setulo-ciliato. 



Plants small, consisting of a prostrate caudex and more or less ascending, some- 

 what complanate, leafy stems and flagelliform branches; branches of the caudex 

 and the flagelliform branches axillary-intercalary, branches of the leafy axis infre- 

 quent, ventral-intercalary in the axils of the underleaves; stem in transverse section 

 of a cortical layer of 6-15 cells, with the ventral rows smaller than the rest, surrounding 

 6-12 cells of the medulla. Rhizoids in tufts from the bases of the underleaves, or in 

 3 rows of tufts on the caudex and the flagelliform branches. Line of leaf insertion 

 oblique, the leaves succubous. Leaves ovate-lanceolate, bifid to the middle, the 

 segments lanceolate, the cells mostly longer than broad, the walls uniformly thick- 

 ened. Underleaves conspicuous, bifid or occasionally trifid to the middle, the segments 

 slender. Male inflorescence terminal becoming intercalary on the stem, the bracts 

 and bracteoles similar to the leaves and underleaves, densely imbricate. Female 

 inflorescence on a very short branch from the caudex or a flagelliform branch, the 

 bracts and bracteoles in 3 or 4 series. Perianth 3-keeled above, the mouth 3-lobed, 

 the lobes variously laciniate and ciliate. Vegetative reproduction from globose masses 

 of cells formed on the caudex or the flagelliform branches. 



Type species: Alobiella bifida Stephani, 1908. 



Key to the Species 



Leaves when well developed, plane, widely spreading, leaf segments from a 4- to 

 6-celled base ; margins of the female bracts and bracteoles of the inner series 

 variously toothed and ciliate. 1. L. portoricense. 



Leaves when well developed often concave, sometimes spreading; leaf segments usually 

 narrow, the base rarely more than 3 or 4 cells wide ; margins of the female bracts 

 and bracteoles of the inner series entire except for a lateral tooth on each side. 



2. L. bifidum. 



1. Leueosarmentum portoricense Fulford, sp. nov. 



Folia plerumque plana, late patentia, segmenti basi 4-5 cellulis latitudine; cel- 

 lulae 39-45 X 26 /a, margine bractearum bracteolarumque dentibus ciliisque. 



Plants of small to medium size, whitish green, in loose mats or among other 

 bryophytes; leafy stems 0.5-1.5 cm long, from a stolon-like leafless caudex or from 

 stolon-like flagelliform branches 2-4 cm or more long, rarely branched; branches of 

 the caudex and the flagelliform branches axillary-intercalary, leafy or flagelliform, 

 the occasional branches of the leafy stem ventral-intercalary in the axils of the 

 underleaves, leafy or flagelliform; leafy stem in transverse section with the dorsal 

 cortical cells larger than the ventral, and larger than the cells of the medulla. 

 Rhizoids abundant, on the underleaves or in tufts in three rows on the caudex 

 and flagelliform branches. Leaf insertion oblique, the leaves succubous. Leaves 

 approximate to imbricate, plane to somewhat concave, ovate, bifid to one-half the 

 length, the segments long, slender, the cells mostly longer than broad; cells of the 



