268 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



SURINAME: sJ., Funck in Hb Nees, as H. pterygophyllum f. intermedia (STR), s.l., 

 Hb Montagne (PC). 



BRAZIL: Rio Negro, Spruce, Hep. Sprue, as M. pterygophyllum (Y) ; Rio Uaupes, Jutica, 

 Campos, Liitzelberg 23636, 23636a — var. brasiliense Reim., 23715 (Hb Herzog) ; s.l., Bolmer 91 

 (Hb Herzog). 



14. Micropterygium parvistipulum Spruce, Trans. Proc. Bot. Soc. Edinb. 



15: 383. 1885. 



Leafy stems of small to medium size, greenish to yellow-brown, compact, 

 flattened, ascending from a branched rhizome, in mats; stems 0.5-1 cm long, 

 with leaves to 1 mm broad, occasionally irregularly pinnately branched, and 

 with numerous ventral flagelliform branches. Rhizoids in tufts from the scale- 

 leaves of the flagelliform branches. Leaves patent, closely imbricate, usually 

 lanceolate in outline when folded, to 0.64 mm long, ridge-keeled for most of the 

 length, the dorsal and ventral parts more or less equal, the wing conspicuous, 

 of three to five rows of cells, extending down to below the middle, the apex 

 acute or shortly bifid, the margins crenulate and serrate; cells of the apical 

 portion 14—18 n, the wall over each cell strongly convex to mamillose, the walls 

 thickened, trigones distinct, the cuticle verruculose. Underleaves conspicuous at 

 the base of the stem, decreasing in size and becoming obscure toward the apex, 

 the margin irregularly toothed and lobed. Male and female inflorescences and 

 sporophyte not seen. PI. 62. Fig. 14, a-d. 



Habitat : On ledges, banks, and wet rocks in forests. 



COLOMBIA: Vaupes: Rio Vaupes, near Mitii, Randal Cuacuraba, Schultes & Cabrera 

 19272 (FH) ; Rio Kananari, Cachivera Palito, 250 m, Schultes & Cabrera 13112 (FH). 



VENEZUELA: Estado Amazonas: Serrania Parii, Rio Ventuari, Cumbre. 2000 m, 

 Cowan & Wurdack 31327 (NY); Estado Bolivar: Chimanta Massif, Torono-tepui, 2165 m, 

 Steyermark & Wurdack 688 p.p. (NY). 



BRAZIL: Rio Icana, Tunui, Liitzclburg 22947 (Hb Herzog); Rio Negro, Spruce, Hep. 

 Sprue. $ (isotypes, BR, NY, US, Y) ; Rio Negro, Spruce (NY); Rio Negro, S. Gabriel, 

 Spruce, Hep. Sprue, (var. lancijolium) (BR, NY, US, Y) ; Rio Negro, S. Felippe, Lutzelburg 

 22393a (Hb Herzog) ; Rio Vaupes, Jutica, Varadouro, Lutzelburg 23636b (Hb Herzog) ; s.l., 

 Glaziou 144183 (NY). 



Certain packets of this collection contain plants with leaves in which the 

 cell walls are plane or only convex and not mamillose. These have been cited 

 under M. pterygophyllum. 



15. Micropterygium bialatum Fulford, sp. nov. 



Caules foliosi ad 2 cm longi, viridi-brunnei, complanati; folia brevia, late 

 ovata, concava, carina alarum pari una instructa; foliorum cellulae 12-16 ft, 

 mamillosae, cuticulo verruculoso ; amphigastria saepe magna basim caulis versus, 

 supra parviora vel paullis cellulis compositae. Partes aliae non visae. 



Plate 62 



Fig. 14. Micropterygium parvistipulum. 14 a. Stem, ventral view, X 175. 14 b. Portion of a 

 leaf, X 150; M, large mamillae. 14 c. Cells of the dorsal lamina near the apex, X 700. 



14 d. Superficial verruculose mamillae of the leaf cells, profile view, X 700. 



Fig. 15. M. bialatum. 15 a. Stem, dorsal view, X 75. 15 b. Stem, ventral view, X 75. 



15 c. Cells from the dorsal lamina near the apex, X 700. 15 d. Verruculose mamillae of the 

 dorsal surface of the leaf cells, profile view, X 700. 15 e. Double wing, near the leaf apex, 

 X 300. 15 f . Transverse section showing the double wing, X 300. 15 g. Portion of a transverse 

 section of a stem, X 300. 



Figure 14 drawn from an isotype, fig. 15 from the type. 



