1968] 



LEAFY HEPATICAK OF LATIN AMERICA PART III 



329 



3-keeled above, the mouth broad, truncate, spinose and short-ciliate. Gemmae 

 spherical from the tips of leaves, rare. 



PI. 83. Fig. 1, a-c. 

 Habitat: On decayed logs, tree trunks or more rarely on soil banks. 



MEXICO: Chiapas: Mapastepec, Sharp 4576, 4702A p.p. (TENN) ; Hildago: Chapatla, 

 6200 ft, Sharp 5659 (TENN); Puebla: vv of Huauchinango, Sharp 991 (TENN). 



GUATEMALA: Baja Verapaz: near Jicaro, 4600 ft, Sharp 2689 p.p. (TENN), near Finca 

 Bucaral, 6000 ft, Sharp 2784 (TENN), Civija, 4000 ft. Sharp 5167 p.p. (TENN). El Progreso: 

 above Morazan, 4300 ft. Sharp 5097 (TENN), near Finca Piamonte, 2400-2500 m, Steyermark 

 43434 (F). El Quechi, above Nebaj, 8500 ft, Sharp 2527 ( 9 ) (TENN). San Juan Ixcoy: Hue- 

 huetenango, 8800 ft, Sharp 4988 p.p. (TENN). Quezaltenango: Totonicapan, 3100-3200 m, 

 Standley 84549 (F), above Chiquival, 7700 ft. Sharp 2076, 2077 (TENN). 



2. Nowellia yunckeri Fulford, sp. nov. 



Caules parvi, subtiles, subvirides, 1-2 cm longi; folia impariter biloba, segmento 

 dorsali late triangulari, acuto, segmento ventrali paucis cellulis; sacculo magno, 

 inflato, orbiculato. Amphigastria obsoleta. Perianthii os irregulariter crenulatum. 



Plants small, coarse thread-like, dull green often becoming brownish red, in 

 dense mats or creeping among other bryophytes. Stems 1-2 cm long, with leaves 

 to 0.6 mm wide, rarely branched: branches lateral, of the Frullania type, and ventral- 

 intercalary, leafy, the ventral branches often short, bearing a female inflorescence. 

 Rhizoids long, from cells of the ventral side of the stem. Line of leaf insertion short, 

 nearly transverse. Leaves concave, spreading, ascendant, imbricate, broadly orbicu- 

 lar, shortly bilobed, the dorsal segment broadly triangular from a 5- to 8-celled base, 

 ending in a 2- to 4-celled tip, the ventral segment a blunt tooth of only one or a 

 few cells, the sac large, to half the size of the leaf, inflated, widely spreading or 

 slightly ascendant; cells of the lower part of the dorsal segment mostly quadrate in 

 outline, 26 X 20-26 fi, the walls uniformly thickened, the cuticle essentially smooth. 

 Underleaves absent. Plants dioicous. Male inflorescence terminal becoming inter- 

 calary on a stem or branch, long or short, the bracts equally bifid. Female in- 

 florescence on a short ventral branch, the bracts and bracteoles in 3 series, long-ovate, 

 keeled, bifid, the margins irregularly crenulate. Perianth long, 3-keeled above, the 

 mouth wide, irregularly truncate, crenulate. 



PI. 83. Fig. 2, a-f. 

 Habitat: In dense mats on moist soil bank and on stones in a stream. 



HONDURAS: near Siguatepeque, Yuncker 6527 (type DPU) ; near El Achote, Yuncker 6408 

 (DPU); s.l., Standley 56211 (F). 



3. Nowellia caribbeania Fulford, sp. nov. 



Caules longi, graciles, subtiles, albidi rubro suffusi; folia profunde bifida, seg- 

 mentis aequalibus, longis, apice uniseriata e 4-5 cellulis constato, conniventibus, 

 margine sinus e duabus seriebus cellulorum longe rectangularium constato, sacculo 

 parvo, inflato, oblongo. Amphigastria obsoleta. 



Plants of small to medium size, chain-like, whitish-green becoming tan to rosy 

 purple, in dense mats or creeping among other bryophytes; stems to 2 cm or more 

 long, with leaves to 5 mm wide, appearing to be compressed laterally, occasionally 

 branched; branches lateral, of the Frullania type and ventral-intercalary, leafy, the 

 ventral branches often short and bearing a female inflorescence. Rhizoids abundant 

 from cells of the ventral side of the stem, rather broad, whitish. Line of leaf insertion 

 short, nearly transverse. Leaves broadly ovate from a narrow base, concave, widely 



