MAXON STUDIES OF TROPICAL AMERICAN FERNS. 23 



Lycopodium reflexum Lam. 



II. 1355. Tactic, Aha Yerapaz, altitude 1,600 meters, December, 1907. 



Lycopodium tuerckheimii Maxon, sp. nov. Plate 1. 



Plants epiphytic, pendent, up to 38 cm. long, repeatedly dichotomoua, the divi- 

 sions widely divaricate, very slender, of nearly uniform thickness (1 to 1.5 mm.); 

 leaves light or yellowish green, linear, subulate, appressed and strongly incurved, 

 concave, about 6-ranked, those of the lower branches 3.5 to 4.5 mm. long, of the 

 upper part gradually shorter and, with the gradual development of sporangia, broader 

 at the base; strobiles scarcely or not interrupted, constituting the freely dichotomoua 

 terminal branchlets to a distance of 10 cm. or more ; sporophyls of the ultimate branch- 

 lets crowded, rigid, achene-like, deltoid-ovate, acuminate, strongly carinate, about 

 1.3 mm. long, exceeding the sporangia only by the slender beak; sporangia orbicular, 

 measuring about 9 mm. each way, at maturity invariably protruding beyond the 

 margins of the sporophyls. 



Type in the U. S. National Herbarium, no. 826246, collected upon tree trunks 

 at an altitude of about 1,500 meters in the forest near Coban, Alta Yerapaz, Gua- 

 temala, by Baron II. von Tiirckheim (no. II. 1864), January, 1908. Two earlier 

 collections at the same locality, both by Baron von Tiirckheim, as represented by 

 specimens in the National Herbarium, are: (I) Plants distributed by 0. Keck under 

 no. 208, and (2) others distributed by Captain Smith under no. 95615. The former 

 are perfectly characteristic of the species and agree closely with the type collection; 

 the latter represent a young state, but may safely be placed here. Both were under 

 the name L. verticillatum var. jiliforme Spring. 



The alliance of /,. tuerckheimii is with L. pringtei Underw. & Lloyd,« a Mexican 

 species recently described. From this it differs very constantly in its delicate slen- 

 der parts, its very numerous and widely divaricate branches, and its slender cord- 

 like usually uninterrupted strobiles, these being about one-half the diameter of 

 those of L. pringlei. 



Explanation of Plate 1.— Fig. a, the typo specimen ; b, fertile tips of same. H-. a, scale alxnit J; 

 b, scale 3. 



SELAGINELLACEAE. 



Selaginella cuspidata Link. 

 II. 1386. Tactic, altitude 1,600 meters, December, 1907. 



Selaginella sp. ined., Hieron. in litt. 

 II. 2114. Near Coban, altitude 1,500 meters, February, 1908. 



Selaginella bulbifera Baker. 

 II. 2036. Moist forests near Coban, altitude 1,400 meters, December, 1907. 

 Determined by Dr. G. Hieronymus. 



THE BIPINNATE SPECIES OF CYATHEA. 



During the course of field work in Cuba and Jamaica the writer has 

 been fortunate in collecting all four of the undoubtedly bipinnate 

 species of Cyathea previously described. As these have been and 

 still are more or less misunderstood, one of them (C. minor) being 

 referred even at present to a large tripinnate species, it has seemed 

 desirable, in describing a new species of this alliance, to present a 

 key by which these may be distinguished. Full descriptions will be 

 published shortly in another connection. 



a Bull. Torr. Club 33: 109. 1906. 



