32 A. W. Evans — North American Species of Frullafiia. 



19. Frullania Donnellii Aust., Bull. Torrey Bot. Club, iv: 301. 1879. 

 Plate XIY. figs. 17-29. 



Autoicous : plants closely appressed to matrix, reddish-brown : 

 sterile stems regularly once or twice pinnate, fertile stems more 

 irregularly pinnate : leaves contiguous or imbricated, the lobe orbic- 

 ular-ovate, arching over the stem but not cordate at base, plane or 

 nearly so at the rounded apex, entire ; lobule separated from the 

 stem by a little less than its width, subparallel with it or slightly 

 oblique, short-clavate ; stylus minute : underleaves distant, oblong- 

 obovate, plane, bifid about one third with obtuse or subacute lobes 

 and sinus, entire : leaf-cells of lobe thict-walled"with inconspicuous 

 trigones and no intermediate thickenings : ? inflorescence terminal 

 on the stem or a main branch ; bracts in two or three pairs, sub- 

 equally bifid, the lobe ovate, acuminate, sharply and irregularly 

 incised-dentate, lobule similar to the lobe but usually still more 

 toothed, stylus not distinct ; bracteole free, bifid to or beyond the 

 middle with segments like the lobules ; bracts and bracteoles becom- 

 ing rapidly smaller and less toothed on receding from the perianth ; 

 perianth about half-exserted, compressed on the sides and strongly 

 one-keeled postically, oblong, abruptly narrowed into a short beak, 

 setulose at the mouth ; 5 spike globose, occupying a short branch 

 close to the involuci'e, bracts in about two pairs. 



Stems O'lO™" in diameter ; lobes of leaves 0-60"''^ long and wide ; 

 lobules O-IQ"*" long, 0-12°^'^ wide ; underleaves 0-30™'° long, 0-25"^°^ 

 wide ; lobes of branch-leaves 0-30"^'^ long, 0'25™'^ wide ; branch- 

 underleaves 0-20™°^ long, 0*10™™ wide ; leaf-cells at edge of lobe 

 0-012'^°^, in the middle O-OIS"""^ in diameter and at base 0-035'^'^ long, 

 0-018"''" wide; bract I, lobe 0-90°'°' long, O-SS"^"" wide, lobule 0-90'°°' 

 long, 0*45™'" wide; bracteole I, 0*70'"'° long and Avide ; bract II, lobe 

 0.75mm loxig^ o-45'^'^ wide, lobule 060'^'^ long, 0-35™" wide; brac- 

 teole IT, O-YO"^"^ long, O-SS""™ wide ; perianth 1-20™'" long, 0-70™™ wide. 



On trees ; East Florida (J. Donnell Smith) : Eustis, Florida 

 (Underwood): Monticello, Florida (Lighthipe). 



F. Donnellii seems to be a rare species, but, as sterile material is 

 usually indistinguishable from t. Kunzei^ it has probably been over- 

 looked. The main difference between the two species is to be found 

 in the perichsetial bracts : in !>. Kunzei these are entire or nearly 

 so, while in F. Donnellii the innermost ones at least are strongly 

 incised-dentate. 



The first three species which are here placed in Diastoloha are in 

 some respects intermediate between that subgenus and Thiopsiellay 

 agreeing with the latter mainly in having their lobules parallel with 



