1962] 



LEAFY HEPATICAE OF LATIN AMERICA — PART I 



67 



derleavea Leaves spreading, a little decurved, broadly ovate to orbicular, 

 asymmetric, canaliculate, bifid to one-third or one-half of their length, the sinus 

 broad, broadly triangular, the segments triangular from a broad base, the leaf- 

 margins entire or with an occasional short tooth near the base; cells of the 

 median portion of the leaf averaging 45 X 23 p., the walls thick, intermediate 

 thickenings conspicuous, the cuticle smooth to minutely papillose. Underleaves 

 usually half as long, of similar shape, the lateral margins entire or with one, 

 rarely two, large teeth on both sides. Female inflorescence terminal on the stem, 

 the bracts and bracteoles similar to the leaves, larger. Perigynium conic-cylin- 

 dric, to 4 mm long, straight to slightly arcuate. Male inflorescence and sporo- 

 phyte not seen. Fig. 2, a-d. 



Habitat : On soil. 



JAMAICA: Blue Mountain Peak, Evans 234 (BM, NY), 243 (BM, FH), Orcutt 

 2913, 5319 (BM, US) ; Cinchona, Harris (BM) ; Hardwar Gap. Evans 179 (NY) ; Hardwar 

 Gap to Caledonia Peak, M. Farr 684 (IJ) ; Newhaven Gap, Evans 154 (BM, FH, NY, Y). 



PUERTO RICO: Adjuntas, Pagan 951 (NY); Joyuya Road, Pagan 136 (FH). 



ST. KITTS: Mt. Misery, Box (BM). 



GUADELOUPE: Soufriere, Le Gallo 256 (Hb. Le Gallo). 



MEXICO: Sempoaltepec, Liebmann 137b (type S PA, isotype BM) ; Chiapas: near 

 Las Oasas, 7300 ft., Sharp 3444 (TENN) ; Hidalgo: near Mapastepec, Sharp 4587; Apuko, 

 5600 ft., Sharp 4138 p. p. (TENN); Puebla: w of Huauchinango, 5100 ft., Sharp 922 

 (TENN); Tulancingo, 6200 ft., Sharp 087 (TENN); Veracruz: below Atzalan, 5500 ft., 

 Sharp 5562, 5583 (TENN). 



COSTA RICA: Cerros de Zurqui, Standley & Valerio 50316 (Hb. Herzog) ; s.l., Polo- 

 Tcowsky 468 (BM). 



COLOMBIA: Mt. de Moro, Lindig 206, 207, 210 (G) ; Los Gagues, Alston 7494 (BM). 

 Cauca: Paramo de Las Papas, Bischler 802 (COL). 



BRAZIL: Serra de Itatiaia, Dusen 494, type of /. parva (type G, isotype FH) ; 

 Serra dos Orgaos, Morro Assu, Liitzelburg 6035b, type of I. coilophylla (Hb. Herzog) ; Rio 

 de Janeiro, without collector's name, ex Hb. Liebmann, type of J. conduplicata (S-PA). 



Additional reports iu the literature include: Guadeloupe (Stephani, 1904), Colombia 

 (Gottsche, 1864) and Brazil (Spruce, 1888a; Stephani, 1893b). 



3. Isotachis erythrorhiza (Lehmann & Lindenberg) Stephani, Bull. Soc. Bot. 

 Fr. 36: 185. 1832. 



Jungermannia erythrorhiza Lehman & Lindenberg in Lehmann, Pug. PI. 4: 44. 1832. 

 Isotachis subtruncata Stephani, Spec. Hep. 3: 662. 1909. 



Plants of medium size, reddish to brownish-green, mostly prostrate, in mats ; 

 stems to 2 em long, with leaves to 2 mm broad, occasionally branched ; stems in 

 transverse section ten or twelve cells in diameter, the cortical cells in one layer, 

 mostly smaller and with slightly thicker walls than those of the medulla. Rhizoids 

 long, in tufts on the lamina of the underleaves of the lower part of a stem. 

 Leaves imbricate, appressed, rarely erect-spreading, orbicular, bifid to one-fifth 

 of their length, the segments short, triangular from a broad base, the sinus 

 lunulate or rarely obtusely triangular ; leaf margins entire or with one or two 

 obscure teeth on one or both sides ; cells of the median part of the leaf long, av- 

 eraging 20 X 30 fx. t the walls uniformly thickened or with intermediate thick- 

 enings, the trigones small, inconspicuous, the cuticle smooth; the marginal cells 

 smaller, with thicker walls. Underleaves smaller than the leaves, cuneate, bifid 

 to one-half of their length, the segments narrowly triangular, the margins en- 

 tire or with one or two teeth on one or both sides, the cells as in the leaf. Female 

 inflorescence terminal on the stem, the bracts and bracteoles similar to the 



