NO. 8 FERNS FROM SOUTH AMERICA MAXON II 



pirmatifid to within 1.5 or 2 mm. of the costa, the costa 

 yellowish, elevated on both surfaces, sulcate above ; upper 

 leaf surface sparingly but persistently hispidulous throughout, trie 

 hairs short, antrorse, whitish, extending to and along the margins ; 

 lower leaf surface sparingly puberulous throughout, the hairs 

 whitish, unequal, mostly patent; segments about 15 pairs below the 

 serrate (finally subentire) apex, those of the lower two-thirds of the 

 pinna subequal, spreading, oblong, about 4 mm. broad at the base, 

 obtuse (more or less acutish in drying), slightly concave, the mar- 

 gine entire, revolute, ciliate ; veins simple, 6 or 7 pairs, oblique at 

 an angle of less than 45 , extending to the margin, slightly elevated 

 on both surfaces, whitish ; sori small, 3 to 7 pairs, medial in attach- 

 ment, appearing slightly nearer the margin than the midrib ; 

 sporangia setose (setae 0.13 to 0.19 mm. long, hyaline, acicular), the 

 annulus 14-celled ; spores diplanate, nearly smooth ; indusium small, 

 soon shrivelling, copiously whitish-ciliate. Leaf tissue firmly herba- 

 ceous, yellowish green beneath, not glandular. 



Type in the U. S. National Herbarium, no. 761336, collected in 

 the vicinity of Matucana, Peru, altitude 2,375 meters, July 9, 1914, 

 by Dr. and Mrs. J. N. Rose (no. 18667). 



Dryopteris Rosei, which is known only from the type collection, is 

 a member of the subgenus Lastrea as redefined by Christensen * and, 

 according to his treatment, 2 need be contrasted only with the rare 

 D. leucothrix C. Chr., 3 of Bolivia, the type specimen of which for- 

 tunately is available for comparison. From this D. Rosei differs 

 very obviously in most characters, particularly in its shorter stipes, 

 its shorter and narrower lamina, its shorter and much broader pinnae 

 (these not narrowly linear), its closer and much larger segments 

 and more numerous veins, its shorter-ciliate indusia, its setose sporan- 

 gia, and in its less pronounced hairy covering, D. leucothrix being 

 densely pubescent beneath, the hairs longer and very numerous. The 

 sporangia of D. leucothrix are devoid of setae. 



EQUISETACEAE 



EQUISETUM BOGOTENSE H.B.K. 



Peru : Vicinity of Matucana, alt. 2,375 rneters (18646). 

 Chile: Vicinity of La Serena (19285). 



1 Biologiske Arbejder, tilegnede Eug. Warming, pp. 73-85. 191 1. 



2 Dansk. Vid. Selsk. VII. Naturvid. Abh. io 2 : 53-282. 1913. 



3 Smithsonian Misc. Coll. 52 : 377. 1909. 



