44 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Costae with numerous spreading hairs beneath, these extending to the 



costules and often to the veins ; primary raohis unarmed, or plainly 



nrnleate only toward the base, the secondary rachises merely 



muricate. 



Pinnae and pinnules petiolate ; costae and costules devoid of bullate 



scales 6. A. myosuroides. 



Pinnae and pinnules sessile; costules bearing small, subpersistent, 

 white or yellowish, bullate scales beneath. 

 Segments pinnatifid ; primary and secondary rachises with occa- 

 sional large flat persistent white scales 7. A. mexicana. 



Segments deeply incised to deeply crenate-serrate ; rachises devoid 

 of large whitish scales. 

 Bullate scales deciduous, few, confined to the base of the cos- 

 tules ; segments sparsely hirsute above along the costules 



and veins 8. A. scabriuscula. 



Bullate scales persistent, numerous ; segments glabrous above. 



9. A. bicrenata. 



1. Alsophila quadripinnata (Gniel.) C. Chr. Ind. Fil. 47. 1905. 

 Polypodium quaclripinnatum Gmel. Syst. Nat. 2^: 1314. 1791. 

 ■Polypodium pruinatum Swartz. Journ. Bot. Schrad. 1800^: 29. 1801, 

 Alsophila priiinata Kaulf. ; Kunze, Linnaea 9: 99. 1834. 

 Lophosoria pruinata Presl, Abh. Bohm. Ges. V. 5 : 345. 1848. 

 TricTiosorus glaucescens Liebm. Dansk. Vid. Selsk. Skrivt. V. 1: 283. 1849. 

 Trieliosorus densus Liebm. Dansk. Vid. Selsk. Skrivt. V. 1 : 284. 1849. 

 Tricliosorus frigidus Liebm. Dansk. Vid. Selsk. Skrivt. V. 1: 284. 1849. 

 fAlsophUa scJiaffneriana Fee, Mgm. Foug. 8: 109. 1857. 



Mountains of Veracruz, Puebla, Oaxaca, and Chiapas, ascending to 3,000 

 meters. Central America to Chile and Argentina ; Greater Antilles, the type 

 from Jamaica. 



Rhizomes stout, up to 3 meters high (usually less than 1 meter), often mul- 

 ticipital, densely lanate with lax, tortuous, pale rusty, capillary scales; fronds 

 2 to 4.5 meters long, long-stalked, the blades subtriangular, tripinnate-pinnatifid. 



2. Alsophila salvinii Hook, in Hook. & Baker. Syn. Fil. 36. 1866. 

 Alsophila munchii Christ, Bull. Herb. Boiss. II. 5: 734. 1905. 



Region of San Pablo, Chiapas, at 2,200 meters altitude. Also in the moun- 

 tains of Alta Verapaz. Guatemala, at 1,400 to 1,600 meters elevation, the type 

 from Chilasco. 



Trunk 1 to 1.5 meters high ; blades very ample, at least 1.5 meters broad, the 

 primary and secondary rachises blackish, polished, woody, nearly or quite 

 smooth ; pinnae 60 to 80 cm. long, 20 to 30 cm. broad ; pinnules 22 to 25 pairs, 

 close, spreading ; segments 1 to 2 cm. long, 3 to 4 mm. broad, obtusely pinnatifid 

 or crenately lobed ; costae and costules deciduously paleaceous beneath, the 

 scales minute, many of them substellate, with blackish spinous processes. 



3. Alsophila marginalis Klotzsch, Linnaea 18: .542. 1844. 

 Heinitelia marginalis Jenman, Ferns Brit. W. Ind. Guian. 43. 1898. 



Sierra San Nolasco, Oaxaca. Also in British Guiana, the type locality. Very 

 rare. 



Stipe sparsely short-aculeate, paleaceous above; blades 1.5 to 1.8 meters long, 

 deciduously paleaceous ; pinnae alternate, elongate-oblong, 20 to 38 cm. long, 

 gibbose-articulate ; pinnules sessile or short-petiolate, spreading, hastate- 

 lanceolate, or ligulate from a cordate base, 2 to 8 cm. long, 8 to 15 mm. broad, 

 sinuate to deeply crenate; sori in a continuous line 1 to 1.5 mm. from the 

 margin. 



