6 A. W. £Jvans — N'orth American Species of Frullania. 



teoles bifid with narrow, acute or acuminate lobes, obtuse sinus and 

 entire margins ; perianth immersed to or above the middle, com- 

 pressed, oblong, abruptly narrowed into a short, broad beak, with 

 two deep postical, and two less pronounced antical keels : 3 bracts 

 in two or three pairs below the involucre, corresponding bracteoles 

 connate on one side. 



Stems 0-1 8""" in diameter; lobes of leaves 1-20"™ long, I-IS™™ wide, 

 lobules 0-82°"° long, O-SV""" wide, inflated part 0-45'"" long; under- 

 leaves 0*65™™ long and wide; leaf -cells from edge of lobe O-OJY"™, 

 from middle 0-029'"'", and from base O-OSS'""" in diameter ; bract I,' 

 lobe 1-65'"'" long, 0*80'"'^' wide, lobule O'SO""" long, 0-45'°'^ wide (to 

 point of coalescence with lobe and bracteole) ; bracteole I, 0*60'"'° 

 long, 0"40'°'" wide (to point of coalescence); bract II, lobe 1-20'"'° 

 long, 0-70'"'" wide, lobule 0-50'"'^' long, 0-2'7'"'" wide, bracteole II, 

 0-3'/'"'" long, 0-25'"'" wide; perianth l-80'"''^' long, O-QO"^^-" wide.' 



On trees ; Caloosa River, Florida (J. Donnell Smith). 



Chonanthelia is better represented in the American tropics than 

 in any other part of the world, and the range of our only known 

 species extends as far south as Chili. Other members of the sub- 

 genus should be lo»ked for in southern Florida. Taylor's original F, 

 arietina was apparently a composite species, and I have followed 

 Spruce in restricting the name to plants with paroicous inflorescence.' 

 This very unusual character and the jieculiar lobules Avill serve 

 at once to distinguish the plant from all our other Frullanice. 



SuBGExNUS II.— TRACHYCOLEA Spruce. 



ICey to the Species. 

 Autoicous. 



Lobule more than half the size of the lobe, 2. F. Oakesiana. 



Lobule less than half the size of the lobe, often explanate. 



Perianth truncate and abruptly narrowed into a short beak ; 

 bracteoles free from the bracts. 4. F. inflata. 



Perianth not truncate, gradually naiTOwed into a short beak ; 

 bracteoles connate on one side with bracts. 5. F. Catalince. 



' The Roman numerals refer to the position of bract or bracteole: thus, I signifies 

 the bract or bracteole next to the perianth ; II, the bract or bracteole of the next 

 outer row ; and so on. 



'^ The species of Frullania are of course not constant in size, and the measurements, 

 which are taken from average-sized plants, are merely of comparative value. 



^ The specimens of F. arietina in the Taylor herbarium, all of which came from 

 Demerara, the second of the localities mentioned in the Synopsis, are paroicous and 

 agree with those described and distributed by Spruce. 



