— 12 — 



Macrospores smooth or with only slightly irregular 

 or net-like wrinkles, but with a more or less dis- 

 tinct ring either equatorial or crown-like on the 

 inner pointed surface. 



Macrospores tetrahedral or globose with slight 

 crown-shaped rings on the outer surface. With 

 6-12 marginal hairs on each side of leaf; terminal 

 bristles o.6-o.8mm. long; strobiles as long as 

 9 mm S. Hanseni Hieron. (California) 



Macrospores lenticular, with a gibbose equatorial 

 ring. 



With 8-14 marginal hairs on each side of leaf; 

 terminal bristles o.o8-o.i5mm. long; strobiles 

 0.5cm. long S. Extensa Underw. (Mexico) 



With shoots as long as 50cm. often with the 

 branches and branchlets coiled like ostrich 

 plumes, with 1-4 short marginal hairs on each 

 side of leaf, very short terminal bristles, few 

 marginal fairs ' on sporophylls, and macro- 

 spore s,-jn,<fistinctly netted on the basal side. 

 . . . . S. 'struthioloides (Presl) Underw. (Oregon) 



SOME NORTH AMERICAN PTERIDOPHYTES. 



By B. D. Gilbert. 



Asplenium anceps Solander. — This species, which I 

 announced in my Working List of N. A. Pteridophytes as grow- 

 ing in Florida, was originally described by Sir William Hooker in 

 "Icones Filicum," with the name given to it which Solander had 

 written on the label to his specimens in the Hookerian herbarium. 

 In the Latin description, the rachis is said to be like the stipes, 

 "black or brown-purple, shining, triangular, with the margins or 

 angles narrowly winged." Further on Hooker remarks in Eng- 

 lish, that "this appellation (viz., anceps) is not entirely applicable 

 to the three angles of the stipes and rachis." It is this point upon 

 which I wish to comment. The Latin word anceps signifies two- 

 edged, but it does not follow that the edges must necessarily be 

 opposite each other. So far as I can judge from the examination 

 of a large number of specimens, Hooker's description of the 

 rachis as "triangular" is misleading. It is quite rounded on one 

 side, so that it might be said to form a rounding obtuse angle. 

 But the other two angles are sharp and stand one on each side of 

 the furrow of the rachis. It is these angles which are "winged" 

 with a series of lighter colored cells, and these angles are un- 



