Neue Litteratur. 25 



results of his recent investigation of several groups of American 

 species commonly included in the genus Dryopteris, and indicates 

 the main groups, together with brief mention of the more impor- 

 tant diagnostic features of each. — Maxon.] 



Christensen, C. 1911. The pteridophyta of the Arctic regions. 

 (Amer. Fern Journ. I. p. 65—70.) [Following a discussion of the 

 climatic and other conditions which mainly determine the distri- 

 bution of Pteridophyta in the Arctic, the writer presents a list of 

 32 species which are known to occur in these regions. All of these 

 are common to northern Europe and North America. — Maxon.] 



Christensen, C. 1911. Two new bipinnatifid species of Alsophila. 

 (Rep. Spec. nov. X. 243/7. p. 213 214.) 



Clute, W. N. 1910. A fern new to the United States. (Fern Bull. 

 XVIII. p. 104 — 105.) [The writer records the occurrence of 

 Nephrodium mexicanum in the Chiricahua Mountains, Arizona, 

 upon specimens collected by James H. Ferriss, which he regards 

 as distinct from N patulum. Maxon.] 



Clute, W. N. 1910. A hunt for Lonchitis. (Fern Bull. XVIII. p. 

 111 — 115.) [An article, reprinted from the Amateur Naturalist, 

 describing the vvriter's search in Jamaica for Lonchitis aurita. — 

 Maxon.] 



Clute, W. N. 1911. Another form of Dicksonia. (Fern Bull. XIX, 

 p. 7 — 8.) [Describes Dicksonia pilosiuscula forma Poyseri Clute, 

 from Maine. Maxon.] 



Clute, W. N. 1911. Asplenium Andrewsii. (Fern Bull. XIX. p. 3-4. 

 1 pl.) [Descriptive notes on Asplenium Andrewsii A. Nelson, descri- 

 bed from Colorado in 1904. Its supposed relationship to A. Bradleyi 

 of the eastern United States is discussed. The Illustration is of a 

 plant from the type locality, which is the only known locality. — 

 Maxon.] 



Clute, W. N. 1910. Asplenium Glenniei. (Fern Bull. XVIII. p.101- 

 104.) [The writer calls attention to the fact that Asplenium Glen- 

 niei Baker, described originally from Mexico, is known from the 

 United States only upon specimens collected in Arizona by Lern- 

 mon, long ago. The general resemblance of this species to certain 

 forms of A. fonlanum is mentioned, and both species are illustra- 

 ted by text figures. — Maxon.] 



Clute, W. N. 1911. Hemigramma latifolia. (Fern Bull. XIX. p. 46 — 

 48. 1 pl.) [Brief descriptive notes and an Illustration of Hemi- 

 gramma latifolia, from the Philippine Islands. — Maxon.] 



[Clute, W. N.] 1910. Rare forms of Fernworts, XVI. (Fern Bull. 



XVIII. p. 106—111.) [Notes upon the production of intermediate 

 forms of normally dimorphic ferns. An intermediate form of the 

 ostrich fern is named and figured as Struthiopteris germanica 

 forma obtusilobata Clute. Onoclea sensibilis f. obtusilobata also is 

 figured. — Maxon] 



[Clute, W. N.] 1911. Rare forms of Fernworts, XVII. (Fern Bull. 



XIX. p. 11 — 14. 1 fig.) [Notes on Botrychium simplex and several 

 related species. — Maxon.] 



[Clute, W. N.] 1911. Rare Forms of Fernworts , XVIII. fFern Bull. XIX. 



p. 50 — 52. 1 fig.) [Notes upon several forms of Dryopteris margi- 



nalis (L.) Gray, with illustrations. — Maxon.] 

 Clute, W. N. 1911. The distribution of Asplenium alternans. (Fern 



Bull. XIX. p. 38-42.) 

 Clute, W. N. 1910. Two new Polvpodies from Arizona. (Fern Bull. 



XVIII. p. 97-98. 1 pl.) 



