Maxon — A Neglected Fern Paper. 113 



however, is that of Retzius, and it is questionable whether the substitution 

 (by Christensen) of Mliller as parenthetical authority in the Kuntze cita- 

 tion is justifiable. The Miiller reference was known to Watt and apparent- 

 ly was regarded by him as that of the earliest publication, for at page 403 

 of the same volume (1868) he definitely lists the species as D. spinulosa 

 (Miill.). 



Dryopteris spinulosa remota (A. Br.) Watt, op. cit. 159. 



The name is written by Watt "D. spinulosa-retnota" and the entry is as 

 follows : 



" Aspd. remotum A. Br.; Nephrodium r [emotum] Hook. Br. Ferns, t. 22: 

 Aspd. Boottii Tuckerman. Dr. Gray refers Dryopteris remota here (as A. 

 spinulosmn var. Boottii)^\t may prove to be a distinct species; it is not 

 well known to me." 



According to Christensen's Index Filicum Aspidium remotnm is Dryopteris 

 filix-mas X spinulosa. The plant of eastern North America formerly 

 called Aspidium Boottii or Dryopteris Boottii is now regarded as a hybrid, 

 D. cristata X intermedia Dowell, 1908. 



Dryopteris arguta (Kaulf.) Watt, op. cit. 159. 



A proper transfer of Aspidium argutum Kaulf., 1824, Nephrodium 

 rigidum var. aniericanum Hook., 1862, being cited as a synonym. This is 

 the Pacific Coast plant which has usually been known as Dryopteris rigida 

 arguta (Kaulf.) Underw., 1893. It is, however, specifically distinct from 

 the European D. rigida and has recently been reinstated ^ by the writer as 

 D. arguta (Kaulf.) Watt. 



Dryopteris rigida (Hoffm.) Watt, op. cit. 159. 

 Watt's entry after this name is as follows: 



"Not of Gray, 1. c. 631. [1848.] A. rigidum, Swartz, 53. Attributed to 

 North America by Mr. Bentham — doubtless in error." 



The reference here is clearly to the European plant which has been 

 confused with its two American allies, D. arguta (Kaulf.) Watt and D. 

 cristata X intermedia Dowell. 



Cystea bulbifera (L.) Watt, op. cit. 160. 



A transfer of Polypodium bulbiferum L. This is the common plant of 

 eastern North America generally known as Cystopteris bulbifera (L.) 

 Bernh., 1806, or perhaps more properly as Filix bulbifera (L.) Underw., 

 1900. 



Cystea montana (Lam.) Watt, op. cit. 160. 



A transfer of Polypodium montanum Lam., 1778, partly by association 

 with Aspidium montanum Swartz, 1801. 



This is the boreal plant of Eurasia and North America known as Cystop- 

 teris montana (Lam.) Bernh. or Filix montana (Lam.) Underw., 1900. 



lAmer. Fern Jonrn. 1:3. 1921. 



