THE FERN BULLETIN 



59 



Hans, A. Polystichum acrostichoides X Angular e. 

 Fern Bulletin, Ja. 1908. — An account of hybridizing 

 the species mentioned. 



Hans, A. Polystichum acrostichoides recurvation. 

 Fern Bulletin ja. 1908. 



Kaufman, P. Rue Spleenwort and Cliff Brake. 

 American Botanist, F. 1908. 



Maxon, W. R. Studies of Tropical American Ferns 

 No. i, illust. Contributions from the U. S. National 

 Herbarium, Mr. 30, 1908. — Description of various 

 new species mostly from tropical America. 



Robinson, C. B. Botrychiums in Sand. Torreya, 

 N. 1907. — B. lanccolatum, B. matricariae folium and 

 a form of B. ternatum on sand dunes near the Gulf 

 of St. Lawrence. 



Terry, \Y. A. A New Variety of the Ostrich Fern. 

 Fern Bulletin, Ja. 1908. — The variety pubescens de- 

 scribed. 



Yamanouchi, S. Spermatogenesis, oogenesis and 

 fertilization in Nephrodium. Illust. Botanical Ga- 

 zette Mr. 1908. — Reports the number of chromo- 

 somes in the gametophyte to be constant (64 in 

 number) . 



