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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Key to the Species 



Leaf apex broad, rounded, bordered by cells elongate parallel to the margin ; the 



cells to 65 X 20 fi. 1. A. acroscypha. 



Leaf apex narrow, blunt to subacute, not bordered; marginal cells 26-34 fi long and 



wide. 2. A. dominicensis. 



1. Alobiellopsis acroscypha (Spruce) Schuster, Nova Hedwigia 10: 25. 1965. 



Cephalozia subg. Alobiella, acroscypha Spruce, On Cephalozia 30. 1882. 

 Alobiella acroscypha (Spruce) Stephani, Spec. Hep. 3: 354. 1908. 



Plants small, whitish, flaccid, prostrate, in patches in depressions on clay soil; 

 stems slender, delicate, to 1 cm long, with leaves 0.5-1.0 mm wide, occasionally 

 branched; branches ventral-intercalary, leafy or stoloniferous-flagelliform, often 

 becoming leafy; stem in transverse section 6-8 cells across, the cortical layer of 11-14 

 rows of cells surrounding a medulla of similar cells. Rhizoids abundant, long, from 

 the ventral side of the stem, sometimes slightly brownish. Line of leaf insertion 

 oblique. Leaves widely spreading to patent, distant to approximate, orbicular, mostly 

 0.37-0.45 mm long, 0.2-0.25 mm wide, the apex broad-rounded or more rarely 

 truncate or emarginate, the margins entire, bordered by elongate cells parallel to 

 the margin, to 65 X 20 fx\ cells of the upper part of the leaf 26-33 X 26-33 /x, those 

 of the lower half elongate, the walls uniformly thickened, the trigones tiny, the 

 cuticle verruculose. Underleaves absent or of 1 or 2 cells on vegetative stems, 

 becoming larger, conspicuous, ovate to bidenticulate toward a female inflorescence. 

 Plants dioicous. Male inflorescence terminal becoming intercalary on the stem or 

 long branch, the bracts in 4-10 series, broad-ovate, the dorsal edge folded up to 

 form a pouch, monandrous; antheridia very large, short-stalked. Female inflores- 

 cence terminal on the stem or branch, the bracts and bracteoles in 1-3 series, the 

 outer series leaf-like, the inner series larger, the bracts and bracteoles bifid to one- 

 third their length, the segment margins entire. Perianth short, cylindrical below, with 

 3 broad rounded keels above, the mouth somewhat contracted, lobed and crenulate 

 to spinose. Gemmae 2-celled, in greenish clusters at the tips of stems. Sporophyte 

 not seen. 



PI. 91. Fig. 1, a-e. 



Habitat: In depressions on clay soil. 



PERU: Monte Guayrapurina, Spruce, Hep. Spruce, (type MANCH, isotypes BM, G-1912, 

 NY). 



2. Alobiellopsis dominicensis (Spruce) Fulford, comb. nov. 



Alobiella dominicensis Spruce, Jour. Linn. Soc. Bot. 30: 355. tab. 26, figs. 5-9. 1895. 



Plants small, flaccid, prostrate, in whitish or reddish patches in depressions on 

 clay soil; stems short, to 1 cm long, with leaves 0.5-1 mm broad, branches frequent, 

 ventral-intercalary, leafy or flagelliform and becoming leafy in the outer part; stems 

 in transverse section of a cortical layer of 10-12 rows of cells with 2 ventral rows 

 smaller, surrounding the medulla of similar cells. Rhizoids abundant from the under- 

 side of the stem, long. Line of leaf insertion oblique. Leaves widely spreading to 

 ascendant, the 2 rows often tending to be folded together, distant to imbricate, ovate, 

 0.4-0.5 mm long, 0.2-0.25 mm broad at the middle, the apex narrowed, rounded, 

 blunt-pointed or truncate, the margins entire, not bordered; cells of the apical 

 margin mostly 26-34 jx long and broad, of the lateral margins longer, cells of the 

 upper part of the leaf 34-40 /x long and broad, the walls uniformly thin, the trigones 



