NO. 1 steere: mosses 5 



tentia et languide crispa, concava, lineali-lanceolata, 2 mm. longa, 

 0.2-0.3 mm. lata, apice acuta, valde concava; folii margo aequus, 

 integer; costa robusta, percurrens, superficiei dorsalis parte superior! 

 papillosa; cellularum basalium saepta aliquantulum crassa, elongata 

 vel rectangularia: cellulae superiores quadrangulares, saeptis crassis, 

 tenuiter papillosae, 7-8 X 9-10 /x longae margine, costam versus 

 maiores; antheridia, archegonia et fructus ignota. 



Sterile; plants dark green, perennial, simple to sparsely branching, 

 in deep tufts, aquatic; stems 2-4 cm. long, closely approximated, 

 parallel, lax, green and leafy above, becoming reddish-brown and 

 leafless below, more or less covered with a thin felt of tangled white 

 radicles, which become reddish with age; leaves in three ranks which 

 are spirally arranged on the stem, disappearing below or with only 

 the stout costa remaining, squarrose-spreading when moist, spread- 

 ing and slightly crispate when dry, especially the apical leaves, con- 

 cave, linear-lanceolate, about 2 mm. long and 0.2-0.3 mm. wide at 

 the broadest part, tapering gradually to an acute, very concave apex; 

 leaf-margin plane to slightly recurved, entire except for the papillae 

 borne by the marginal cells; costa stout, up to 50 /x. in diameter half 

 way up the leaf, consisting of greatly elongated cells in the basal 

 portion and of rectangular cells in the upper half, distinctly papil- 

 lose on the dorsal side above and less conspicuously so on the ventral 

 surface above, percurrent or nearly so, in cross-section showing 

 mostly 4-6 guide cells, with a broad dorsal stereid band and a nar- 

 rower ventral one, the outermost cells on both sides differentiated, 

 but not as large as the guide cells; basal cells with somewhat 

 thickened walls, without papillae, those at the extreme basal margin 

 linear, the others somewhat elongated to rectangular, passing very 

 gradually in the upper part of the leaf into thick-walled, finely papil- 

 lose, four-angled or rounded cells which are smaller and wider than 

 long at the margin, 7-8 /x X 9-10 yn, but become progressively some- 

 what larger and occasionally longer than wide toward the costa. 

 Antheridia, archegonia and fruit unknown. 



In the spring at "Baroness von Wagner's" place, associated with 

 Callicostella pallida (Hornsch.) Jaeg., Santa Maria (Charles or 

 Floreana) Island, Galapagos Islands; January 28, 1934; W. R. 

 Taylor No. 1014 (type specimen, in the U. S. N. Herbarium). 

 , The only other American species of Barbula in this section is B. 

 Ehrenbergii (Lor.) Fleisch. var. mexicana Ther., which has been 



