Dowell: New ferns described as hybrids 137 



in the fertile fronds ; pinnulae 10-15 pairs, linear-oblong to oblong, 

 acute or obtuse, somewhat falcate, serrate or the lower incised, 

 the lobes spinulose-toothed with appressed teeth ; sori nearer the 

 " ' 'n than the margin, indusia thin, reniform, glandular, not 



large. 



In general appearance this fern resembles the Clinton fern 

 more than the other, but it diners from that fern in the deeper 

 cutting of its pinnae and in having glandular indusia, which are 

 also smaller. It differs from D. intermedia in its more elongate 

 shape, in the greater difference between its sterile and fertile fronds, 

 in being less cut or divided, and in having the sori nearer the mid- 

 vein. It resembles Boott's fern, D. cristata x intermedia, more 

 than it does any other. This is to be expected when we consider 

 that they have one parent species in common and the other {D. 

 cristata and D. Clintoniana) so closely allied that most botanists 

 have heretofore placed one as a variety of the other. It diners 

 from Boott's fern in being usually larger, wider in proportion to the 

 length, being less deeply cut, having the pinnulae more falcate, the 

 teeth more incurved or appressed, and the sori nearer the midvein. 

 In the type locality and near Cornwall, Conn., vigorous plants of 

 this fern were not rare. In the type locality I should call it fairly 

 abundant, as abundant as Boott's fern, which grows in luxuriance 

 in that locality. It was found associated with the alleged parent 

 species in the following localities, except Bulls Head, where I have 

 found only one plant of this fern and no plant of D. Clintoniana 



J 



Mac 



land, September 3, 1906, DoweU 4606, type; July 27, 1907 



5o6g. 



July 23, 1905* Dowell 3928 



l 907, 5 26 9 ; Bulls Head, Staten Island, August 3, igDS,3995; 



A 



C Benedict J2 and 267. 



j 



Dryopt 



Dryopteris Goldieana celsa Palmer, Proc. Biol. Soc. Wash 



1899. 



0-50 



Avmzome rniCK, cnany . sh^ — j- . A^h-^r- renter or 



* the base with thin light-brown scales having a darker center, or 



