1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



257 



DOMINICA: Boiling Lake, Miss Noel 29 (Y) ; Morne Diablotin, Elliott 664, 667 

 (BM); Morne Micotrin, Elliott ElOlfi, 104, H57 (BM); Soufriere, Elliott 819a, 845 ? (BM) ; 

 Morne Trois Pitons, Elliott 2261a (BM). 



MARTINIQUE: Mt. Price 600-1200 m, Dim 159, 277 2 (NY). 



VENEZUELA: Estado Amazonas: summit. Cerro Duida, Sleyermark 58383a p.p. (F) ; 

 Estado Bolivar: summit Torono-tepui 2165-2180 m, Stcyermark & Wurdack 704 p.p. (NY). 



The above records from South America are the first for the species outside of the 

 West Indies. These specimens are like the type from Guadeloupe except that they are 

 slightly larger. 



6. Micropterygium exalatum Stephani, Spec. Hep. 3: 547. 1909; Icon. Hep., 



Micropterygium No. 3. 



Leafy stems numerous, from a branched rhizome, small, yellow-brown, 

 prostrate in compact mats; stems flattened, 0.5-1 era long, with leaves 0.4-0.6 mm 

 broad, often branched and with frequent ventral flagelliform branches. Rhizoids 

 on the scale-leaves of flagelliform branches. Leaves closely imbricate, short, 

 broadly ovate, strongly concave, curving upward in the outer part, 0.4-0.5 mm 

 long, keeled, with a narrow wing in the upper part, the margins entire; cells 

 of the apical portion round-quadrate, 18-20 n, the walls thickened, trigones large 

 with convex sides, the cuticle verruculosc. Underleaves decreasing in size from 

 the base of the stem upward, often of only a few cells. Plants dioicous, the 

 sexual branches short ventral, basal on the leafy stem. Male branches very 

 short, the bracts in three pairs, darker, the cells large, the bracteoles narrow. 

 Female inflorescence short, the bracts and bracteoles in three series, the innermost 

 bracts to 0.8 mm long, the apex with two or three short cilia. Perianth not seen. 

 PI. 57. Fig. 6, a, b. 



Habitat: On tree bark and decayed wood. 



PUERTO RICO: El Yunque, Evans 50 p.p. c?, 53a p.p. (Y). 



DOMINICA: without locality, Elliott $ (type, G-10866), Elliott (G-10867), Elliott 

 1936 p.p. (BM) ; Morne Microtrin, Elliott 1092a <? p.p. (BM). 



The plants cited above have much in common with M. carinatum particularly 

 those plants of more xerophytic situations, but the species is readily distinguished 

 by the compact arrangement of the leaves and the very small, few-celled 

 underleaves in the upper part of the stem. 



7. Micropterygium reimersianum Herzog, Hedwigia 81: 226. /. 1. 1944. 



Leafy stems of small to medium size, light yellow-green to yellow-brown, 

 ascendent to erect from the branched rhizome, in large mats, often among 

 other bryophytes; stems lax, flattened, 2-3 cm long, with leaves 1.0-1.5 mm 

 broad, often pinnately branched, leafy branches lateral, rarely ventral, flagelli- 

 form branches ventral, infrequent. Rhizoids on the scale-leaves of the flagelliform 

 branches. Leaves spreading, becoming erect to decurved in the outer part, more 

 or less imbricate, concave, asymmetrically ovate, to 1 mm long, a wing three to 

 five rows of cells wide conspicuous on the upper half or more, the apex acute or 

 notched, the margins distantly serrate, sometimes dentate; leaf cells quadrate to 

 angular, 10-16 n, the walls uniformly thickened or with small trigones, the 

 cuticle faintly verruculose. Underleaves large, orbicular, broader than the stem, 

 concave, the margins entire or with occasional projecting cells or teeth in the 

 upper part. Male inflorescence with the bracts and bracteoles in four to six 

 series, the bracts concave, acute with the tip curved outward, the margins 

 toothed above, the bracteoles small, plane. Female bracts and bracteoles long- 



