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



the streams and on the hillsides surrounding both Chatham 

 and Wafer Bays. It forms trees 8-15 ft. in height, and is 

 apparently the only tree-fern on the island, (No. 227). Fur- 

 ther distr. Mex., W. Ind., S. Am. 



Asplenium L. 



A. cristatumLam. Encycl. II. 310 (1786) : common on wet 

 rocks on the side of a perpendicular cliff near Chatham Bay, 

 (No. 228). Further distr. Mex., W. Ind., S. Am., Old World. 



Ceropteris Link. 



C. calomelanos (L.) Und. Bull. Terr. CI. XXIX. 632 



(1902). Acrostichum calomelanos L,. Sp. PI. 1072 (1753): 

 common on the sides of moist banks on the stream leading into 

 Chatham Bay, (No. 230). Further distr. W. Ind., S. Am., 

 Africa. 



Dryopteris Adans. 



D. parasitica (L.) O. Ktze. Rev. Gen. II. 811 (1891). 

 Poly podium parasitkum L. Sp. PI. 1090 (1753) : abundant at 

 600 ft. The specimens are sterile and doubtful, (Nos. 231-32). 

 Further distr. Mex., W. Ind., S. Am., Old World. 



Elaphoglossum Schott. 



E. apodum (Klf.) Schott, Gen. ad. t. 14 (1834). Acros- 

 tichum apodum Klf. Enum. 59 (1824) : occasional specimens 

 were found growing on rotten logs on the banks of the stream 

 leading into Wafer Bay, (No. 229). Further distr. W. Ind., 

 northern S. Am. 



Hymenophyllum Sm. 



H. sp : on the side of a wet perpendicular cliff near Wafer 

 Bay. The specimen is sterile, (No. 233). 



Nephrolepis Schott. 



N. biserrata(Sw.) Schott, Gen. Fil. ad. t. 3 (1834). Aspid- 

 ium biserratum Sw. Schrad. Jour. 1800. II. 32 (1801) : one 

 of the most abundant ferns on the island. It grows in great 

 profusion on the hills surrounding Chatham Bay, in places 



