BrittON: West INDIAN MOSSES 675 
DISTRIBUTION: Jamaica, Cuba, Haiti, Porto Rico, Guade- 
loupe, and Barbados to South America; also Mexico (Yucatan). 
ILLUSTRATION: Hedw. Descr. pl. 11 (from Swartz’ type). 
ExsiccaTAE: Sull. Musci Cub. Wright. 98. 
43. Turckheimia linearis (Sw.) E. G. Britton, comb. nov. 
Tortula linearis Sw. Fl. Ind. Occ. 3: 1765. 1806. 
_ Barbula linearis Brid. Mant. Musc. 88. 1819. 
Trichostomum lineare Broth. E. & P. Nat. Pfl. 1°: 394. 1902. 
HABITAT AND TYPE LOCALITY: “‘On dry calcareous rocks, His- 
paniola.”’ 
DISTRIBUTION: Jamaica, Cuba, and Haiti. 
Our spécimens from Jamaica and Cuba have a well-developed, 
slender peristome, which disappears from the old capsules. I 
believe this species to be congeneric with Turckheimia guate- 
malensis Broth., which also shows traces of a peristome though 
the capsules are all old. The section of the leaf in T. linearis is 
remarkable for having two rows of guide-cells of about Io cells 
each in the costa, with a stereid band both aboveand below. The 
costa is rather broader thanin T. guatemalensis and smooth on the 
dorsal side, showing as a prominent white rib tothe leaf. It is papil- 
lose on the upper surface and the cells of the blade bear several 
minute papillae on both surfaces. This peculiarity of the costa 
removes Turckheimia linearis from Trichostomum; and although 
there is but a single row of guide-cells in T. guatemalensts, their 
macroscopic resemblance is so close that they appear to be 
congeneric. 
44. IsopTERYGIUM TENERUM (Sw.) Mitt. Jour. Linn. Soc. 12: 499. 
1869 
Hypnum tenerum Sw. Fl. Ind. Occ. 3: 1817. 1806. 
HABITAT AND TYPE LOCALITY: ‘“‘On trunks of trees, mountains 
of Jamaica.” 
DIstTRIBUTION: Jamaica, Cuba, Haiti, Guadeloupe, Martinique, 
St. Lucia, to Trinidad and South America; also Bermuda, and 
Louisiana to Florida. 
ExsiccaTaE: Sull. Musci Cub. Wright. 107. 
