on 



MEMOIRS OF THE NEW YORK ROTANICAL GARDEN 



[VOL. 11 



8. Undcrleaf margin dentate to dentate-ciliate, the teeth two to several 



cells long, often red-tipped. fi. I. hacmatodes. 



1. Leaves with numerous marginal teeth (rarely only a few). 



2. Margins of the underleaves, including the sinus, appearing scalloped, serrulate 



to denticulate, the teeth mostly of one cell, reddish. 8. I. Undigiana. 



2. Margins of the underleaves with larger teeth. 

 3. Teeth of the underleaves mostly long, slender. 



4. Underleaves oblong-ovate, the sinus narrow, U-shaped, the segments erect. 



6. I. haematodes. 



4. Underleaves more or less orbicular, the sinus shallow, broad, the segments 



as such, not conspicuous. 7. I. auberti. 



3. Teeth of the underleaves mostly broad, shorter. 



4. Underleaves bifid to one-half of their length, the margins often incised with 



one to four sharp teeth; plants pale, greenish-brown. 9. I. grossidens. 



4. Underleaves bifid to one-third or one-half of their length, the margins with 

 usually four to many teeth. 

 5. Plants pale green to greenish-brown; median leaf -cells without inter- 

 mediate thickenings. 4. J. madida. 

 5. Plants reddish-brown to red; median leaf-cells with conspicuous inter- 

 mediate thickenings. 

 6. Cells of the leaves and underleaves with large, conspicuous, knot-like 

 trigones and intermediate thickenings; underleaves nearly as broad 

 as long. 5. I. serrulata. 

 6. Cells of the leaves and underleaves with the trigones and intermediate 

 thickenings tending to be coalesced, forming an uneven layer of sec- 

 ondary thickening; underleaves longer than broad. 6. I. haematodes. 



1. Isotachis tenax Stephani, Symb. Antill. 3: 277. 1902. 



Plants small, bright red to reddish-brown, prostrate to ascending, in tufts 

 or among other bryophytes; stems slender, 0.5-1 mm long, with leaves to 1 mm 

 wide, irregularly branched, the branches long ; stem in transverse section ten or 

 more cells in diameter, the cortical cells in one or two layers, th/e walls very 

 thick. Rhizoids not seen. Leaves spreading, truncate-ovate, bifid to one-half of 

 their length, the segments triangular, acute to blunt, widely divergent, the sinus 

 V-shaped, the leaf margin entire ; cells of the median portion of the lamina av- 

 eraging 33 X 21 {jl, the walls thick, the knot-like intermediate thickenings con- 

 spicuous, the cuticle minutely striolate-papillose. Underleaves bifid, similar to 

 the leaves, only slightly smaller, the margins entire or more rarely with one to 

 three coarse teeth on one or both sides. Male and female inflorescences and 

 sporophyte not seen. Fig. 1, a-e. 



Habitat : On soil. 



GUADELOUPE: s.l, Buss 550 (type G, isotype FH). 



The species seems to be endemic to Guadeloupe where it has also been reported by 

 Pagan (1942) and Stephani (1904). 



2. Isotachis multiceps (Lindenberg & Gottsche) Gottsehe, Mex. Leberm. 



105. pi. 14, f. 1-8. 1863. 



Jungermania multiceps Lindenberg in G. L. & N. Syn. Hep. 680. 1847. 

 Jungermania conduplicata Lindenberg in G. L. & N. Syn. Hep. 680. 1847. 

 Isotachis parva Stephani, Arq. Mus. Eio de Janeiro 13: 113. 1903. 

 Isotachis coilophylla Herzog, Eepert. Spec. Nov. 21: 25. pi. 1, f. 2. 1925. 



Plants of small to medium size, red to brownish-green, prostrate to ascend- 

 ing, in tufts or among other bryophytes; stems 1.0-1.5 cm long, with leaves to 

 1.5 mm wide, simple to irregularly branched, the branches long, usually from 

 near the base of the stem; stems in transverse section ten to twelve cells in 

 diameter, the unistratose cortical cells smaller and with thicker walls than those 

 of the medulla. Rhizoids in tufts from the lower part of the lamina of the un- 



