2 
26 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
P. thyssanolepis A. Br. Kl. Linn. XX. 392 (1847)— 
ALBEMARLE Ist.: 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.: Asi. 
Polystichum Roth. 
P. aculeatum (L.) Schott, Gen. Fil. ad t. 9 (1834). Poly- 
podium aculeatum L. Sp. Pl. 1090 (1753). Aspidium acu- 
leatum Sw. Schrad. Jour. 1800, 2, 37 (1801)—ALBEMARLE 
Ist.: 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). 
Polypodium adiantiforme Forst. Prod. 82 (1786). Aspidium 
coriaceum Sw. Syn. Fil. 57 (1806); Rob. (1), 106.—ALBE- 
MARLE Ist.: Villamil, occasional on the south side of the 
mountain at 3150 ft. (no. 803). James Isx.: Darwin. Fur- 
ther distr. W. Ind., S. Am., Old World. 
P. apiifolium (Sw.) C. Ch. Ind. 64 (1905), 578 (1906). 
Dicksonia apiifolia Sw. Schrad. Jour. 1800, 2, 91 (1801).— 
James Is_.: 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—Axsrtnepon Ist.: 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.—Gatapacos Ips.: Capt. Wood. 
Further distr. Mex., northern S. Am. 
