A. W. Evans — N'orth American Species of Frullania. 17 



9. Frullania Virginica Gottsche in Lehmann, Pugillus, viii : 19. 1844. 



Frullania saxicola Aust., Proc. Acad. Phila. for 1869: 225. 



Frullania Sullivaniii Aust., Proc. Acad. Phila. for 1869: 226. 



Plate VIII. 

 Dioicous : plants closely appressed to matrix, green, varying to 

 brownish : stems irregularly pinnate : leaves imbricated, the lobe 

 suborbicnlar, arching over the stem and cordate at base, decurved at 

 the rounded apex, entire ; lobule galeate, truncate at base, somewhat 

 inflated throughout, separated from the stem by about one-sixth its 

 width ; stylus minute, two or three cells wide at base : underleaves 

 distant, rhombic-ovate, bifid about one-thii'd with subacute lobes and 

 acute sinus, entire or rarely unidentate on the sides: leaf-cells of 

 lobe rather thick-walled with conspicuous trigones and intermediate 

 thickenings, especially toward the base : $ inflorescence terminal on 

 the stem or a main branch ; bracts in two or three pairs, unequally 

 bifid, the lobe squarrose, ovate to orbicular, rounded at the apex, 

 entii'e, lobule ovate to lanceolate, acute or apiculate, bearing a small 

 tooth-like segment or stylus at or above the middle of the inner 

 edge, otherwise entire ; bracteole free or connate on one or both sides, 

 ovate, bifid one fourth to one- third with acute lobes and sinus, mar- 

 gins entire, crenulate or slightly dentate ; perianth half exserted, 

 somewhat compressed cya the sides, obovate, abruptly narrowed into 

 a short, broad beak, with a distinct angled postical keel and usually 

 with two or more supplementary antical and postical ridges, more or 

 less tuberculate, particularly oh keels and ridges : $ bracts in many 

 pairs, occupying the end or middle part of a short latei'al branch and 

 forming an oblong spike. • 



Stems 0-10"^™ in diameter; lobes of leaves 0-55™™ long, 0-45"^'" wide, 

 lobules 0-28'"'" long, 0-18™"' wide; underleaves 0-22°>'" long, 0-15'^'" 

 wide; leaf-cells from edge of lobe 0014""^, from middle 0-018"^'", and 

 from base 0-025"" in diameter; bract I, lobe 0-80"" long, 0-65™" 

 wide, lobule 0-75"" long, 0-35"" wide ; bracteole I, 0-80"" long, 

 0.55mm ^vide; bract II, lobe 0-65"" long, O-SS""^ wide, lobule 0-65"" 

 long, 0-30"" wide; bracteole II, 0-60'°" long, 0-25"" wide ; perianth 

 1.35"" long, 1-00"" wide. 



On trees or, more rarely, on rocks ; from Canada to the Gulf of 

 Mexico : rare in the north but becoming abundant southward. Dis- 

 tributed in Muse. Alleg. n. 267 (as F. dilatata, var. 1) and in Hep. 

 Bor.-Amer. n. 103 and n. lOJf (as F. saxicola). 



It will be seen that there have been included under this very varia- 

 ble species two forms which were considered distinct by Austin. 



Trans. Conn. Acad., Vol. X. Mat, 1897. 



Q 



