28 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Proliferous. 



Apex of lamina acute; bud borne upon the 

 rachis, below the apex. 



Rachis slender, straight: pinna? lanceo- 

 late, the inferior basal pinnule great ly 



reduced 14. P. polystichi/ormis. 



Rachis stout, flexuous; pinnae elongate- 

 triangular, the inferior basal pinnule 



scarcely reduced 13. /'. platyphyllum . 



Apex of lamina truncate; bud terminal. 

 Lamina ovate, tripinnatifid or tripin- 



nate 3. P.christianae. 



Lamina narrowly lanceolate, bipinnati- 

 fid to bipinnate. 

 Lamina chartaceo-coriaceous, bi- 

 pinnate; pinna* 35 to 40 pairs.. 8. P. heterolepis. 

 Lamina extremely coriaceous, bi- 

 pinnatifid, only the superior 

 basal segment free; pinnae 20 to 

 30 pairs 5. P. dissimulans. 



1. Polystichum triangulum (L.) Fee, Gen. Fil. 279. 1850-1852. 



Poly podium triangulum L. Sp. PL 2: 1088. 1753. 



Aspidium triangulum Sw. Schrad. Journ. Pot. 1800 -: 31. 1801. 



Poly podium muriratum Sw. Prodr. 131. 1788, not L. 1753. 



Polypodium echinatum Gmelin, Syst. Nat. 2'-': 1309. 1791. 



Aspidium mucronatum Sw. Schrad. Journ. Pot. l( 0-: 30. 1801. 



t Aspidium trapezoides Sw. Schrad. Journ. Pot. 1800': 31. 1801. 



Polystichum mucronatum Presl, Tent. Pterid. 83. 1836. 



t Polystichum cyphochlamys Fee, Gen. Fil. 279. 1850-1852; 6me Mem. 20. pi. .i. /. 4. 

 1853. 



? Polystichum falcatum Fee, Gen. Fil. 279. 1850-1852, not Diels, 1899. 



Polystichum echinatum C. Chr. Ind. Fil. 83. 1905; 581. 1906. 



The basis of the Linna^an Polypodium triangulum is the '* Trichonvincs folio triangulo 

 dcntato" of Petiver, illustrated at plate 1, figure 10. This is obviously redrawn from 

 Plunder's plate 72, which represents a plant said to have come from Santo Domingo. 

 The further names to be considered in fixing upon the limits and synonymy of this 

 strictly West Indian species are as follows: 



1. Polypodium muricatum Sw., 1788. Founded upon Sloane's plate 36, figures 4 

 and 5, these representing Jamaican plants, probably of different species. In publish- 

 ing the name mucronatum to replace his homonym muricatum, Swartz in 1801 again 

 cites these two figures. In 1806," however, he restricts his citation to figure 4 which 

 thus may be held as typical of his species mucronatum. Put figure 4 shows only a 

 broad form of P. triangulum, b and mucronatum will thus become a synonym of trian- 

 gulum. Figure 5 is discussed under the next name following: 



2. Polypodium echinatum Gmelin, 1791. The original description is brief, based 

 upon Sloane's plate 30, figures 4 and 5, which, as noted above, probably represent dif- 

 ferent species. If typified arbitrarily by figure 4, P. echinatum is synonymous with 

 A. mucronatum Sw. and must be written as a synonym of P. triangulum. The spinu- 

 lose character shown in fiinire 4 is sufficient to indicate that this rather than fijrure 5 



«F1. Ind. Occ. 3: 1649.-1806. 



bThe strictly Jamaican species which Hooker mistakenly regarded as mucronatum, 

 and which lie figured under that name, is P. struthionix; see page 37. 



