1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



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orbicular to longer than broad, the apex with one to four teeth. Plants dioicous, 

 the short sexual branches ventral from near the base of the leafy stem or rarely 

 from the rhizome. Male branches small, hyaline to brownish, the bracts in 

 two to four pairs, long-ovate, inflated, acute to bifid, and with toothed margins, 

 the bracteoles plane, ovate, 2- to 4-toothed above as in the underleaves. Female 

 brunches very short, the bracts in three series, more or less keeled, at first 

 whitish, then becoming brown, the innermost bracts long-ovate, to 1.5 mm long, 

 divided to one-fourth of their length into two or three long narrow, ciliate 

 segments, the lateral margins short-ciliate. Perianth 4-5 mm long, the mouth 

 contracted, long ciliate. Sporophyte not seen. PI. 59. Fig. 10, a, b. 

 Habitat: Moist clay, sand, logs, and trees in mist forests. 



COLOMBIA: Meta: Cordillera La Macarena, Pico Renjifo, Cano Tiranas, 1700 m, 

 Schultes & Cabrera 11227 (FH). Caqueta: Rio el Hacha, Woronow 181, 182a (Hb Herzog). 

 PERU: Tatanera, Lechler, the type [not seen]. 



11. Micropterygium bolivarense Fulford, sp. nov. 



Caules foliosi 0.5-1 cm longi, e viridibus fuscis ad brunneos, vix complanati; 

 folia parva, concava, ex acutis ad breviter bifida, marginibus integris vel dente uno 

 apicem versus instructis, ala absentia vel rare inchoata; foliorum cellulae 16-18 /*, 

 mamillis magnis, trigonibus conspicuis, cuticulo crasse verruculoso; inflorescentiae 

 masculae feminaeque non visae. 



Leafy stems of small to medium size, dark green to brown, scarcely flattened, 

 prostrate or ascendent from a branched rhizome system, scattered among other 

 bryophytes; stems 0.5-1 cm long, with leaves 0.4-0.9 mm broad, sometimes 

 becoming flagelliform, branches frequent, leafy, ventral or lateral. Rhizoids 

 colorless, in tufts on reduced leaves of attenuate stem tips. Leaves symmetric, 

 deeply concave, ovate, without or rarely with a keel-ridge, the apex acute or 

 shortly bifid, often curved upward, the margins entire, serrate, or with an 

 occasional tooth near the tip, a wing absent, or rarely rudimentary, of a few 

 cells, on occasional leaves conspicuous, narrow; leaf cells 16-18 p., with a very 

 large mamillose projection over each cell, trigones conspicuous, the cuticle rough, 

 warty. Underleaves near the base of the stem large, orbicular, concave, those 

 toward the tip often becoming smaller, the cells as in the leaf. Male and female 

 inflorescences and sporophyte not seen. PI. 60. Fig. 11, a-e. 



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

 in dense forests. 



VENEZUELA: Estado Bolivar: Chimanta Massif, Torono-tepui, 2168-2170 m, 

 Steyermark & Wurdack 695 p.p. (NY) ; Rio Paragua, salto de Aurima 275 m, Killip 37852 

 (type, VEN), 37353 p.p. (VEN) ; se Cerro Venamo, tributary of Rio Venamo, 950-1000 m, 

 Steyermark & Dunsterville 92244 p.p., 92246 p.p., 92259 p.p., 92310 p.p. (VEN) ; Auyan-tepui 

 tributary of Rio Churun, 1760-1800 m. Steyermark 93830, 93602 p.p., 93667 (NY) ; tributary of 

 Rio Churun, 2050-2300 m, Steyermark 93951, 93953, 98998 p.p., 98999, 94022 (NY). 



The distinguishing characters of the species are the concave leaves without wings, and 

 the extremely large mamillae with rough-warty cuticle, on the cells of the leaves and 

 underleaves. 



Plate 59 



Fig. 9. Micropterygium pterygophyllum. 9 a. Stem, ventral view, X 75. 9 b. Cells of the 

 dorsal margin of a leaf near the apex, X 700. 9 c. Row of elongated cells at the line of 

 attachment of the wing, X 700. 



Fig. 10. M. lechleri. 10 a. Stem, ventral view, X 75. 10 b. Cells of the dorsal margin 

 of a leaf near the apex, X 700. 



Figure 9 drawn from the type. 



