42 Benedict: New hybrids in Dryopteris 



the present status of our knowledge of these plants. The known 

 hybrids are marked with a cross. 



The first of these to be described was D. cristata x spimdosa^ 

 which has been recognized in Europe since 1855, but in America 

 has only recently been differentiated by Dowell * from D, cristata x 

 intermedia^ \ox\^ known as D. Boottii. The first typically Ameri- 

 can hybrid to be described was Davenport's D, cristata x margin- 

 alis^ which had been discovered and recognized by Raynal Dodge. 



D, CUnioniana 



D. cristata 



D, G old i an a 



D, intermedia 



D. marginalis 

 D. spinulosa 



Following this came the hybrid between D, marginalis ^.v\d D. spin- 

 ulosa^ described as D. pittsfordensis by Miss Margaret Slosson, 

 whose.experlmental production of the Dodge hybrid and o^ Aspic- 



T 



ninm platy neuron x Camptosorns rhizopliyllus has furnished a defi- 

 nite basis for a further study of these plants. Dr. Philip Dowell, 

 the next in the field, besides recognizing D. cristata x spimtlosa 

 as an American plant, gave D. Boottii its proper name {cristata x 

 intermedia)^ and described the corresponding Clintoniana cross, D. 

 Clintoniana x intermedia^ and three interesting Qoldiana hybrids, f 

 In addition to these, the hybrids described in the present paper 

 and one between Clintofiiana and marginalis to be described by 

 Miss Slosson, and two others which are held for further study, 

 bring the number known in this group to fourteen, leaving only 

 the one between Goldiana and spinidosa yet to be found. t 



But there is no apparent reason why hybrids should not occur 



* Bull. Torrey Club 35 : 135-140. 1908 



t Zcr. ait. 



was 



and a description of it is included below. 



