264 Broadhurst: Struthiopteris in North America 



Alta Verapaz, "Walclungen," Pansamala between S. Pedro 

 Carina and Senahu, altitude 3,800 ft., von Turckheim 640 (N). 

 Alta Verapaz, near the Finca Sepacuite, Cook & Griggs 417 and 

 420 (N). 



i) 



G: 



Figure i. Types of frond bases found in the North American species of 

 Struthiopteris. 



The adnate dilated bases mentioned by Liebmann are most 

 characteristic of the specimens mentioned above; though no 

 Mexican specimens have been seen, Liebmann's full description 

 leaves no doubt that the Guatemalan specimens belong to this 

 species. 



The Costa Rican and Panama specimens examined differ in 

 being more gradually reduced at the base (type C), in having pro- 

 portionately broader pinnae which are more abruptly acuminate, 

 and in having shorter lower pinnae (4-6 cm. long) which are more 

 contracted at the base and farther apart (2-4 cm.). The three 

 Costa Rican specimens, Pittier 10176 ("Forets de la Palma," 

 Pacific slopes) and U. S. National Herbarium no. 575237 and no. 

 575 2 39 (both the latter without definite locality, collected by 

 Werckle, 1 901-1905) are in these respects intermediate between 

 the Guatemalan plants and the one from Panama, Maxon 5526 

 (humid forests of Cuestade Las Palmas, southern slope of Cerro 

 de la Horqueta, Chiriqui, altitude 1,700-2,100 m.). Since 

 Pittier's no. 10176 is the only one with a fertile frond it does not 

 seem best to separate these more southern plants at present. 



2. S. exaltata (Fee) Broadh. comb, now 



Lomaria exaltata Fee, Mem. Foug. 11 : 10. pi. J. 1866. 



Plant terrestrial. Rhizome erect or ascending, 4-40 cm. long, 

 the scales lanceolate to ovate-lanceolate, about 1 cm. long, 2-2.5 

 mm. wide, tobacco brown. Sterile fronds 30-90 cm. long; stipes 

 20-30 cm. long, slightly to decidedly angulate, marked usually 



