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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



one or two cells, the sinuses lunulate, the margins more or less obscurely serrate ; 

 leaf-cells thin-walled but becoming thick-walled, the lumina rounded, the tri- 

 gones small and coalesced, the cuticle smooth to faintly verruculose; cells of the 

 apical portion 16-18 p., uniform, those of the interior and base larger. Under- 

 leaves approximate, broadly ovate, mostly 1 mm long, 1.5 mm broad at the 

 strongly cordate base, the auricles large, approximate, undulate, with several 

 long or short tooth-like appendages, or rarely incised, the lateral and apical 

 margins undivided, obscurely serrate. Male branches short. Female inflorescence 

 and sporophyte not seen. Fig. 51, a-c. 



Habitat : Not given. 



ECUADOR: si, Fraser 1 (type BM) ; s.L, Fraser (ex Hb. Levier 1228) (as M. super- 

 bum) (G). 



Section 5. Vittatae 



The plants of this section have three-toothed leaves (often obscurely so in 

 B. nitida and B. luterostipa) , in which a vitta of several rows of elongate cells 

 with conspicuous trigones is more or less well developed. The line of leaf inser- 

 tion is curved in the upper half, the underleaves are never attached to the leaves, 

 and enlarged appendages are never developed on the leaves or underleaves. 



The American species are of medium size to small, and tend to form a clearly 

 distinct unit within the genus, yet some of the species, namely the B. nitida- 

 B. heterostipa complex, are not so clearly delimited. Because of the generally 

 Antarctic distribution of most of the species, it would seem that the group as 

 a whole is an ancient one. 



52. Bazzania spruceana Stephani, Hedwigia 32 : 213. 1893. 



Bazzania planiuscula Spruce, Trans. Proc. Bot. Soe. Edinb. 15: 376. 1885. (quoad pi. 

 Guayrapurina.) 



Mastigobryum spruceanum Stephani, Spec. Hep. 3: 469. 1908. 

 Mastigobryum burchelii Stephani, Spec. Hep. 3: 509. 1908. 



Plants small, brownish-green becoming brown ; stems slender, 3 cm or more 

 long, with leaves to 2 mm broad ; lateral branches frequent, 2 mm or more apart, 

 diverging at a wide angle ; flairelliform branches occasional. Leaves vittate. imbri- 

 cate, plane, subrectangular, ascendent, 0.7-0.9 mm long, 0.4 mm broad at the 

 base, narrowed a little to the mostly transversely truncate, tridentate apex: 

 teeth acute, spreading, two to five cells long, two to six cells broad at the base, 

 the margins entire, the leaf-cells round-quadrate in outline, the walls uniformly 

 thickened, the lumina rounded, trigones inconspicuous or absent except in the 

 cells of the vitta, the cuticle very strongly verruculose ; cells of the apical region 

 16-22 p., those of the vitta to 48 X 24 p.. Underleaves distant to imbricate, sub- 

 quadrate in outline, a little broader than the stem, mostly 0.35 p. long and broad, 

 the apex entire, crenate, undulate or 2^-lobed. Sexual branches not seen. Fig. 

 52, a-c. 



Habitat : Not given. 



PERU: Mt. Guayrapurina, Spruce (isotypes G, FH). 



BRAZIL: s.l., Burchell 3847 p.p., PI. Brasil Trop., type of M. burchelii cited incorrectly 

 as from "Fretum Magellanieum" (NY). 



