12 A. W. Evans — North American Species of Frullania. 



into a short, broad beak, with a distinct angled postical keel and one 

 or more less pronounced antical and postical ridges : ^ bracts in one 

 or two pairs, occupying a short branch near the involucre and form- 

 ing a short, oval spike. 



Stems 0-10°^" in diameter ; lobes of leaves 0'60™° long, 0-55'»'° 

 wide, lobules 0-16™'" long, 0-23'^™ wide (when explanate, 0'30'°"° long, 

 Q.23mm wide); underleaves 0-30™'" long, 0-27'""' wide ; leaf-cells from 

 €dge of lobe O-OIG"™, from middle 0-020°''" in diameter and from base 

 0-030'""" long, 0-020'"'" wide ; bract I, lobe 1-20'"'" long, 0-70"'"' wide, 

 lobule O-SO"'"" long, 0-45"^°^ wide ; bracteole I, 0-75"" long, 0-30"'"' 

 wide, bract II, lobe .0-90'"'" long, 0-60'"" Avide, lobule 0-60""" long, 

 0.30mm ^vide; bracteole II, 0-65'"" long, 0-20"^™ wide ; perianth 1-50""" 

 long, 0-75™" w^ide. 



On rocks in a canon ; Catalina Island, California (McClatchie). 



It will be seen from the foregoing description that F. Catalince is 

 closely related to F. inflata. Its leaves, however, are much more 

 squarrose than in that species, its bracteoles are connate on one side, 

 and its perianth, antheridial spike, and underleaves are 'different in 

 shape. From F. Bolanderi it differs most strikingly in its larger 

 size, autoicous inflorescence and absence of flagella. 



The first four species which I have placed in Trachycolea form a 

 rather distinct group by themselves and have the following characters 

 in common : — (l) the leaf-lobes are scarcely or not at all cordate at 

 base ; (2) the cells of the lobes are pretty uniformly thickened, hav- 

 ing neither conspicuous trigones nor intermediate thickenings ; (3) 

 the postical keel of the perianth is more or less two-angled, so that 

 the perianth is typically trapezoidal in section, although this condi- 

 tion is usually obscured by the interposition of supplementary 

 ridges ; (4) the keels and ridges of the perianth are not tuberculate, 

 although they are sometimes slightly roughened or sinuous on the 

 edges. In all of these points they differ from such typical Trachy- 

 coleae as F. dilatata^ F. Virginica and F. squarrosa, and seem to 

 find their nearest allies in the last three South American F'ldlanice^ 

 which Spruce includes under Chonanthelia. Spruce^ suggests, how- 

 ever, that these three species might better be placed in Trachycolea, 

 with which they certainly seem to have more in common. 



1 Hep. Amaz. et And., 29, 1884. ^ L. c, 30. 



