1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



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elongate, to 27x15 the walls thickened, trigones conspicuous, the cuticle 

 roughly verruculose. Underleaves decreasing in size to the tip of the stem, below 

 broadly ovate and broader than the stem, above becoming very small and 

 narrower than the stem, often 2- to 4-lobed or toothed. Plants dioicous, the short 

 sexual branches from near the base of the leafy branches, the male branch 

 sometimes on a flagelliform branch. Male inflorescence robust, nearly as broad 

 as the leafy stem, the bracts and bracteoles in five to ten series, the bracts 

 ovate, concave, the tip 2- or 3-celled, bracteoles plane, ovate; antheridia in pairs. 

 Female bracts and bracteoles in three series, the innermost bracts 1.0-1.5 mm 

 long, ovate, ciliate-laciniate above. Perianth to 5 mm long, the mouth 3-lobcd 

 and ciliate-laciniate with long cilia. PI. 59. Fig. 9, a-c. 



Habitat: On trees, logs, sandstone rocks, and soil, along streams and on 

 cliffs near waterfalls in the rain forest. 



COLOMBIA: Amazonas — Vaupes: Rio Apaporis, 250 m, Schultes & Cabrera 1101.0, 

 12394 9 (FH) ; Cachivera de Jirijirimo, 250 m, Schultes & Cabrera 12341, 12395, 12398 ?, 

 12406 (FH); nr Rio Pacoa, 250 m, Schultes & Cabrera 12433, 12533, 12543 (FH). Vaupes: 

 Rio Kuduyari, Yapoboda, Schultes & Cabrera 14304 (FH); Rio Vaupes, Mitii, 250 m, 

 Schultes & Cabrera 13879 $ (FH) ; Rio Piraparana, Schultes & Cabrera 15902 ? (FH) ; 

 Rio Tui below Raudal del Yurupari, Schultes & Cabrera 14417 (FH). 



VENEZUELA: Estado Amazonas: nr Cerro Duida, Cario Negros, 250 m, Steyermark 

 57825a p.p. (F) ; Cerro Venamo, e tributary of Rio Venamo, 950 m, Steyermark & Dunster- 

 ville 92228 p.p. 92630 (VEN) ; Casiquiare, Laja da Caraga Lutzelberg 22881a, 22882a (Hb 

 Herzog) ; Rio Cunucunuma, Cerro Huachamacari, 1200 m, Maguire, Cowan & Wurdack 

 29915, 29925 <$ (NY). Estado Bolivar: Sierra Ichiin, 625-726 m, Steyermark 90248 (VEN). 



BRAZIL: Amazonas, Traill (NY) ; Rio Negro, S. Gabriel, Spruce, Hep. Sprue. (BR, NY) ; 

 Bana. de Rio Negro, Spruce (NY) ; Rio Negro, S. Gabriel, Spruce, Hep. Sprue, (some 

 packets of M . parvistipulum var. lancijolium where the leaf cells lack mamillae) (NY) ; 

 Rio Negro, Spruce (NY); selva Amazonis (Rio Negro), Spruce (NY); Rio Uaupes, Jutica, 

 Lutzelberg, 23624, 23800 (Hb Herzog); Rio de Janeiro, [ "Martius or Sellow," fide Reimers] 

 with M. leiophyllum (M) ; without locality, Martius, (mixed with M. leiophyllum (type 

 (?)M) 



The species is also cited from Guadeloupe and Martinique, collected by Duss (Stephani, 

 1904) and from British Guiana, collected by McConnell and Quelch (Stephani, 1901-1905). 

 Most of the plants from Guadeloupe and Martinique have low mamillae on the cells and 

 are included under M. trachyphyllum. Plants of certain packets collected by Spruce in 

 S. Gabriel and distributed as M. parvistipulum var. lancijolium in the Hepaticae Spruceana 

 have very low mamillae or only convex or even plane cell walls. I have considered these 

 plants as M. pterygophyllum while the plants of similar aspect and habit, but with mamillose 

 projections on the leaf cells are cited under M. parvistipulum. 



10. Micropterygium lechleri Reimers, Hedwigia 73: 184. f. 14. 1933. 



Micropterygium angustistipulum Spruce in Stephani, Spec. Hep. 3: 545. 1909; Icon. Hep., 

 Micropterygium No. 1. Not M . angustistipulum Spruce, 385. 1885. 



Leafy stems of medium to large size, light yellowish green to brownish, 

 complanate, erect with recurved tips, from a prostrate, branched rhizome, and 

 forming dense tufts or mats; stems 1-2 cm long, with leaves to 1.5 mm wide, 

 simple to pinnately branched; ventral flagelliform branches infrequent; rhizoids 

 colorless, long, branched at the tips, in tufts on the scale-leaves of flagelliform 

 branches and the rhizome. Leaves spreading, loosely imbricate, ovate, concave, 

 flattened, to 1 mm long, keeled, with a broad wing from the apex to near the 

 base, the dorsal lobe wider than the ventral, the apex obtuse, blunt or rounded, 

 the margins of the leaf and wing entire; leaf cells quadrate to longer than broad, 

 12-15 the walls uniformly thickened, trigones small to inconspicuous, the 

 cuticle rough-verruculose. Underleaves large, squarrose, wider than the stem, 



