19621 



LEAFY HKI'ATICAE OF LATIN AMERICA PART I 



113 



SUBGENUS BIDENTATAE 



The outstanding character of this subgenus is the bidentate apices of the 

 leaves. Occasional three-toothed leaves may occur more or less frequently on 

 some stems and most of the species appear to be related to species in the sub- 

 genus Tridcntatae. 



The line of leaf insertion is oblique and slightly curved in the upper part 

 and the underleaf insertion is straight in all the American species of this 

 subgenus. 



1. Bazzania bidens (Nees) Trevisan, Mem. 1st. Lomb. 13: 415. 1877. 



Jungermannia tridens'*. Montagne, Ann Sei. Nat. Bot. II. 3: 216. 1835. Non C. G. Nees. 

 Herpetium stoloniferum var. bidens C. G. Nees in Montagne, Ann. Sci. Nat. Bot. II 14: 

 333. 1840. 



Mastigobryum bidens Gottsche & Lindenberg in G. L. & N. Syn. Hep. 228. 1845. 



Plants mostly large, yellow-green, becoming deep brown ; stems slender 

 to robust, to 5 em long, with leaves to 3.5 mm broad ; lateral branches mostly 

 5 mm apart, diverging at a wide angle; flagelliform branches numerous, long. 

 Leaves distant to subimbrieate, long, linear-lanceolate, plane or slightly deflexed, 

 1.5-2 mm long, 0.3-0.5 mm broad at the base, little narrowed to the transversely 

 truncate, bidentate apex ; teeth very large, acute, mostly six to eight cells long 

 and three to six cells broad, often divergent, the sinus deep, acute, the margins 

 entire ; leaf-cells thin-walled, the trigones large, with bulging sides, mostly 

 coalesced, the lumina angular-rounded, the cuticle faintly verruculose ; cells of 

 the apical portion 32 X 32 /i, a vitta not differentiated. Underleaves small, 

 distant, subquadrate, a little wider than the stem, 0.35-0.4 mm X 0.3-0.35 mm, 

 the apex undulate, variously toothed or lobed. Male branches frequent, the 

 bracts concave, ovate, bifid, crenulate ; bracteoles similar, smaller, plane ; an- 

 theridia in pairs. Female branches solitary, the bracts divided to one-third 

 their length into two or three laciniae, the margins serrate to laciniate. Perianth 

 and sporophyte not seen. Fig. 1, a-h. 



Habitat : Over rocks, logs and tree trunks. 



PUERTO RICO: s.l., Schwanecke 129 (G) ; El Yunque, Luquillo Mts., Evans 51 (YU, 

 NY) ; El Yunque, Steere 4016, 4160, 4407, 5934 (Hb. Fulford) ; Pagan 494 (NY) ; Sierra de 

 Naguabo, Shafer 3750 (NY). 



GUADELOUPE: s.l., I'Heiminier 129 (G). 



DOMINICA: Morne Trois Pitons, Elliott S3 16 (BM, G). 



MARTINIQUE: s.l., Husnot 241B (FH, G) ; Mt. Pelee, Husnot 246b (G). 



COLOMBIA: Rio Kananari, Scliultes $ Cabrera 14445a, p.p. (US); Ri'o Kiiduyari, 

 Schultes, Cabrera 14466b (US). 



VENEZUELA: Serrania Paru, Cowan Wurdack 31425 (NY). 



FRENCH GUIANA: s.l., Leprieur, (type G, isotype FH) ; s.l., ex Hb. Hooker (NY); 

 St. Jean, ex Hb. Theriot (G) ; Cayenne, Fee 19 (G) ; Leprieur 676 (as Mastigobryum stolon- 

 iferum var. bidens) (G). 



PERU: s.l., Lechlcr (G). 



2. Bazzania phyllobola Spruce, Trans. Proc. Bot. Soc. Edinb. 15: 372. 1885. 



Bazzania bidens var. dissodonta Spruce, Trans. Proc. Bot. Soc. Edmb. 15: 371. 1885. 

 Bazzania dissodonta Spruce ms. 



Mastigobryum dissodontum Stephani, Trans. Linn. Soc. II. Bot. 6: 98. 1901. 

 Mastigobryum phyllobolum Stephani, Spec. Hep. 3: 439. 1908. 

 Mastigobryum heterophyllum Stephani, Spec. Hep. 6: 466. 1924. 



