PHOF. M. W. HAREINGTON ON TROPICAL FEHN3. 



M 



(Linn. See. Journ. xv. 83), H. 



insular form of this plant. 



The Tropical Ferns collected by Professor Steere in the years 

 1870-75. By M. W. Harrington, M.A., F.L.S., Assistant 

 Professor of Botany, University of Michigan. 



[E«ad March 1, 1877.] 



In the following list the American ferns were collected earliest, 

 and are mostly from the Andes of Peru and Ecuador. The For- 

 mosan and Philippine ferns were collected in 1874-75. The spe- 

 cimens were in part identified by me before bringing them to Kew, 

 where Mr. Baker completed the identifications, thus eliminating 

 the novelties for me. My special thanks are due to Mr. Baker, 

 who has aided me much, and to the authorities at Kew, who 

 gave me free access to the herbarium and library. 



The order of arrangement is that of Hooker and Baker's ' Syn- 

 opsis Filicum ;' and before each new species I have given the 

 number nearest to which they would fall in the series as given 

 there. 



I. Old- World Forms. 



Gleichenia dtchotoma, Willd. Posia, Formosa. 



Ctathea spinulosa, Wall, Balabac Is., Philippines. 



Alsophila IjXt kbrosx, Hooker. Luzon, Philippines. 



DiCKsoNiA Barometz, Link. Posia, Formosa. 



14*. HyMENOpnTLLrM thuidium, Harrington, n. sp. 



Stipe slender, 1-3 inches high, winged, from 2-5 in. long, 1-2 

 in. broad, ovate to oblong, tri- or quadripinnate, erect; rachis 

 and branches winged like the stipe ; pinnse 1 in. long or less, del- 

 toid ; wing and ultimate divisions of lamina finely crisped through- 

 out ; surface glabrous ; sori few to many on the upper part of 

 the frond, at the ends of the ultimate divisions, large ; involucre 

 divided nearly to the base j valves large, ovate, crisped. 



jNIountains of Panay, Philippines, growing thickly on the 

 trunks of trees. 



