ORTHOTRICHACEAE 5 1 



A. lapponicum (Hedw.) Schimp. "Crevices of rocks, north- 

 ern N. J.," Muse. App. 154. 



A. Mougeotii (B. & S.) Schimp. "Wet rocks with the pre- 

 ceding," Muse. App. 155; Hamden, Bry. Ct. 



DRUMMONDIA Hook. 



Drummondia usually grows on the bark of trees, but is easily 

 distinguished 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. 



D. clavellata Hook. On trunks and branches of trees, par- 

 ticularly Janiperus Virginiana, and on old stone fences, very 

 common," Muse. App., 152; Cold Spring, Jamaica and Ridge- 

 wood, Lloyds Neck and Greenwood, L. Id.; Bedford, N. Y. 

 Summer. 



ULOTA Mohr. 



The species of Ulota have the characteristic brownish-green 

 or blackish-green color of the Orthotrichaceae. They are dis- 

 tinguished 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. 

 Ulota growing on trees usually grows in more rounded tufts, 

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

 trichum growing in similar situations. The median basal leaf 

 cells are often nearly linear, upper cells slightly papillose to 

 smooth. The books all say that the hairs on the calyptra of 

 Ulota are flexuous, and those on Orthotrichum 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 peristome may be single or double. The seta in Ortho- 

 trichum is so short that the capsule is nearly always partially 



