A. W. Evans — North American Species of Frxdlania. 9 



minute : underleaves distant, rhombic-ovate, bifid about one-third 

 with subacute lobes and sinus, margin entire or bearing one or two 

 teeth on the sides : leaf -cells of lobe with rather thick walls, trigones 

 more conspicuous near the margin, intermediate thickening not de- 

 veloped : ? inflorescence terminal on the stem or a main branch ; 

 bracts in two or three pairs, unequally bifid, the lobe ovate, rounded 

 at the apex, entire or nearly so, lobule narrower than the lobe, ovate, 

 rounded or obtuse, entire but bearing a minute tooth or stylus near 

 the middle of its inner edge ; bracteole connate on one or both sides, 

 very variable, ovate, normally bifid about one-third with acute lobes 

 and sinus, but sometimes rounded or merely emarginate at apex, 

 sometimes with three or four more or less distinct teeth ; perianth 

 about half-emersed, obovate, narrowed into a short, broad beak, with 

 a distinct, usually two-angled, postical keel and one or more antical 

 and postical supplementary ridges : ^ bracts in six to ten pairs, occu- 

 pying a short lateral branch and forming an oblong spike. 



Stems 0-10""^ in diameter ; lobes of leaves O-SS"""" long, 0-30"'™ 

 wide, lobules 0-25'""" long and wide; underleaves 0-18'"'" long, 0-15'"°' 

 wide ; leaf-cells from edge of lobe 0-016™", from middle 0-027, and 

 from base 0-035"^" in diameter ; bract I, lobe 0-80""" long, 0-50™™ 

 wide, lobule O-OO™"" long (to point of coalescence), 0-25'""' wide ; 

 bracteole I, O-eS""" long, 0-35'"'^^ wide ; bract II, lobe 0-65™'" long, 

 0-40'"™ wide, lobule 0-35"™ long, 0-15™" wide; bracteole II, O-GO'"™ 

 long, 0-20'^'" wide ; perianth 1-25"'"^ long, 0-80™"^ wide. 



On trees ; west of the Rocky Mountains, from California to British 

 Columbia. Distributed in Hep, Bor -Amer. v. 105b, and in Hep. 

 Amer. n. 28. 



Frullania Bolanderi is the most widely distributed Trachycolea 

 of the Pacific Coast region and is common in many places. There is 

 little danger of confounding it with any other western species, and 

 the remarkable, upright, leafless flagella, which are usually produced 

 in greater or less profusion, are a ready means of distinguishing it 

 from the eastern species which it most closely resembles. Its nearest 

 ally is perhaps F. Oakesiana, which, aside from the absence of 

 flagella, has a narrower perianth than F. Bolanderi and an autoicous 

 inflorescence. F. Eboracensis occasionally produces flagella-like 

 branches, but they are always leafy and are a rather unusual feature 

 of the plant; its smaller lobule, different areolation, and smooth 

 ti'igonous perianth will also serve to distinguish it. Frullania Ilallii 

 is said by its author to be monoicous ; the specimens of ilall and of 

 Macoun, however, which I have been able to examine are all dioicous 



