MOSSES WITH A HAND-LENS 79 



tinguished from its tree-growing allies by three characters. Its 

 stems are long and closely applied to the bark of the tree, sending 

 out short horizontal branchlets so thickly that the stems below 

 become apparent only when the plant is removed. The capsule is 

 on a long seta, the calyptra is cucullate, and the peristome is so 

 small as to be scarcely apparent. 



Drummondia is named for Drummond, one of the earliest 

 collectors of American mosses. D. clavellata Hook, is our only 

 species. 



ULOTA (Weissia of the First Edition*) 



The Ulotas have the characteristic brownish-green or black- 

 ish-green color of the Orthotrichum family. They are distin- 

 guished from all save Orthotrichum by the hairy calyptra. Both 

 Orthotrichum and Ulota grow on the bark of trees or more 

 rarely on rocks, in cushions of varying size and thickness. The 

 Ulotas growing on trees usually grow in more rounded tufts with 

 the leaves more crisped when dry than is usual with Orthotri- 

 chum growing in similar situations. The books all say that the 

 hairs on the calyptra of Ulota are flexuous, and those on Ortho- 

 trichum straight, but this distinction appears to be rather too fine 

 for the amateur to profit by it. The capsules in both genera are 

 erect and symmetric and quite regularly striate when dry with 

 eight or sixteen ridges and as many alternating furrows. These 

 ridges consist of cells larger, darker, and thicker-walled than the 

 alternating tissue. The seta in Orthotrichum is so short that the 

 capsule is nearly always partially immersed; in Ulota the seta 

 is long enough to exsert the capsule entirely beyond the perichae- 

 tial leaves. 



U. LUDWIGII Brid., the Puckered Ulota, has pear-shaped cap- 

 sules, abruptly narrowed to the very small mouth ; the ridges and 

 furrows extend only a short distance from the mouth of the 

 capsule, giving it the peculiar and characteristic appearance 

 shown in the cut. 



U. CRISPA Brid. The capsules of the Crisped Ulota have a 

 much larger mouth and are Striate for the entire length. The 

 seta is shorter, the color is lighter, and the tufts are rather 

 thicker than in the Puckered Ulota. In the not uncommon 

 variety crispula of the Crisped Ulota the capsule is much 

 shorter and is suddenly contracted into a neck, narrow and much 



