26 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



P. thyssanolepis A. Br. Kl. Linn. XX. 392 (1847).— 

 Albemarle Isl. : Villamil, abundant at 600 ft., on trees at 

 1300 ft., (nos. 989-990). James Isl. : James Bay, occasional 

 on the trunks of trees at 2750 ft. (no. 991). Further distr. 

 S. U. S., Mex., W. Ind., northern S. Am. 



Polystichum Roth. 



P. aculeatum (L.) Schott, Gen. Fil. ad t. 9 (1834). Poly- 

 podium aculeatum L. Sp. PI. 1090 (1753). Aspidium acu- 

 leatum Sw. Schrad. Jour. 1800, 2, 37 (1801). — Albemarle 

 Isl. : Villamil, occasional on the south side of the mountain 

 at 3150 ft. (no. 802). Widely distributed. 



P. adiantiforme (Forst.) J. Sm. Hist. Fil. 220 (1875). 

 Poly podium adiantiforme Forst. Prod. 82 (1786). Aspidium 

 coriaceum Sw. Syn. Fil. 57 (1806); Rob. (1), 106.— Albe- 

 marle Isl. : Villamil, occasional on the south side of the 

 mountain at 3150 ft. (no. 803). James Isl.: Darwin. Fur- 

 ther distr. W. Ind., S. Am., Old World. 



P. apiifolium (Sw.) C. cL Ind. 64 (1905), 578 (1906). 

 Dicksonia apiifolia Sw. Schrad. Jour. 1800, 2, 91 (1801). — 

 James Isl. : James Bay, occasional at 2000 ft. (nos. 882- 

 883). Further distr. Mex., W. Ind., Andean S. Am. 



Pteris L. 



P. aquilina var. esculenta Hook. f. Fl. N. Zeal. II. 25 

 (1855); Rob. (1), 114. — Abingdon Isl.: forms extensive 

 brakes on the south side of the island above 1600 ft. (no. 

 992). Albemarle Isl.: Iguana Cove, Snodgrass and Hel- 

 ler; Villamil, common in open woodland, 1200-1400 ft. ; also 

 common on the southeast side of the mountain at 3150 ft., 

 and on the floor of the crater at 2750 ft., where it forms exten- 

 sive brakes, (no. 993). Chatham Isl.: Wreck Bay, occurs 

 first at 1000 ft., forming extensive brakes at 1700 ft., common 

 at 2100 ft., (nos. 994-996). Further distr. general in tropical 

 regions. 



P. propinqua var. Cumingiana Ag. Sp. Gen. Pterid. 65 

 (1839); Rob. (1), 115.— Galapagos Ids.: Capt. Wood. 

 Further distr. Mex., northern S. Am. 



