112 Proceedings of the Biological Society of Washington. 



Hooker." The authorship of the entire paper is clearly 

 indicated by the running head of page 159, ''Watt — Catalogue 

 of Ferns. " The "list" is not only full of interesting comments 

 but includes ample synonymy in condensed form. The 

 Linnaean references are to the second edition of the Species 

 Plantarum (1763). 



The transferred names, most of which were coined later and 

 independently by other writers, are as follows : 



Polypodium polypodioides (L.) Watt, Canad. Nat. II. 13: 158. 1867. 



This is a transfer of Acrostichum polypodioides L., antedating P. poly- 

 podioides (L.) Hitchc, 1893, applied to the same plant. 



Phegopteris connectile (L.) Watt, op. cit. 159. 



A transfer of Polypodium connectile Michx., 1803, which is usually re- 

 garded as a synonym of Polypodium phegopteris L., 1753. This is Dryopteris 

 phegopteris (L.) C. Chr., 1905. 



Phegopteris rhaetica (L.) Watt, op. cit. 159. 



This, which antedates Phegopteris rhaetica Perard, 1869, is a transfer of 

 Polypodium rhaeticum L., with citation of three synonyms and of two 

 collections from western North America. Polypodium rhaeticum of 

 Linnaeus is an aggregate, containing European elements usually referred 

 to Athyrium fdix-femina (L.) Roth and Athyrium alpestre (Hoppe) Rylands. 

 The American plants referred to by Watt are presumably Athyrium 

 americanum (Butters) Maxon, 1918. 



Phegopteris montana (Vogler) Watt, op. cit. 159. 



This is clearly Dryopteris oreopteris (Swartz) Maxon, 1901, often known as 

 Dryopteris montana (Vogler) Kuntze, 1891. 



Dryopteris' spinulosa dilatata (Hoffm.) Watt. op. cit. 159. 



A transfer of Polypodium dilatatum Hoffm., 1795, antedating D. spinv- 

 losa dilatata (HolTm.) Underw., 1893 = Dryopteris dilatata (Hoflfm.) Gray, 

 1848. The name as written by Watt is "D. spinulosa-dilatata." 



Dryopteris spinulosa (Retz.) Watt, op. cit. 159. 



A transfer of Polypodium spinulosum Retz., 1795, antedating D. spinu- 

 losa (Retz.) Kuntze, 1891. The name is written by Watt as "D. spinu- 

 losa-vera, " apparently to indicate the typical form of this variable species. 



This is the common North American and Eurasian plant listed by 

 Christensen as "Dryopteris spinulosa (Miill.) Kuntze" and as a transfer of 

 Polypodium spimdosum Miill., 1767. The name transferred by Kuntze, 



lAspidium is recognized by Watt as a genus with two sections, Dryopteris and Pol- 

 yslichum. In the enumeration of species these are given the rank of genera, the genus 

 names being abbreviated to "D." and "P.," and the species names changed to feminine 

 form in the case of Dryopteris. Later in the same volume (p. 403. 1868) Dryopteris and 

 Polystichum are taken up as fully valid genera, without any reference to Aspidium. 



