Broadhurst: Struthiopteris in North America 369 



theless it is easy to select single plants from these localities which 

 will justify the distinctions made by Swartz. Abundant material 

 from these localities separates readily according to distribution, 

 showing the following differences, mainly relative but sufficient 

 to separate them. 5. lineata has narrower sterile laminae and 

 narrower, more numerous pinnae, which are more curved, not 

 abruptly but gradually acuminate, shining below, and less revolute. 

 The scales in S. lineata are more numerous and more persistent; 

 they are mixed with finer and shapeless ones, which are more or 

 less appressed to the stem ; the costae contrast markedly with the 

 commonly naked ones of S. striata, as do the smoother, often 

 shining, under surfaces of the pinnae with the finely araneous 

 condition of the strongly raised veins on the under surface of 5. 

 striata. A plant from Santo Domingo (Eggers 2041, "monte 

 Barrero," altitude 1,100 m.) has very heavy, more numerous 

 (58-jugate), narrow, close pinnae with deeply cordate bases; the 

 rachis is densely chaffy and also fibrillose, and the scales on the 

 costae are numerous, more uniform, and heavier in texture. More 

 material might make possible its separation from 5. lineata. 

 ■ Some recent material from Cuba, collected by J. A. Shafer at 

 Oriente (no. 4150 and no. 9038), shows plants with very narrow 

 fronds, and narrow pinnae which (when fully mature) are heavier 

 than any of the 5. lineata specimens seen, except the plants men- 

 tioned above collected by Eggers. Shafer's no. 8059, also from 

 Oriente, is like S. lineata in the narrow lamina but has short and 

 proportionately broad pinnae (suggesting S. striata, in proportion 

 only) ; as in S. lineata, the margins are subentire to almost ser- 

 rate, not revolute, and the veins are not raised below; the scales 

 throughout are more like those of striata; the stipes are dark reddish 

 brown and the rachises similar. More material from Cuba is most 

 desirable; excepting S. Shaferi these are the only Cuban repre- 

 sentatives of the petioled species. 



16. S. rufa (Spreng.) Broadh. comb. nov. 



Lomaria rufa Spreng. Nova Acta 10: 230. 182 1; Syst. 4: 

 63. 1827. 



Lomaria robusta Fee, Gen. Fil. 69. 1852. 



Plants terrestrial. Rhizome subarboreous (in Duss 4164, 20 

 cm. long and 12 cm. thick), the scales 2.5-3.5 cm. long, linear, 1-2 



