382 Broadhurst: Struthiopteris in North America 



jugate, 15-17 cm. long, the terminal pinna 11-16 cm. long, 5-7 

 mm. wide, heavy, sometimes with a sterile apex 2-5 mm. long, 

 the base cordate, petioled (lower 5 mm.), occasionally with spur- 

 like protuberances;* the margins of the pinnae have whitish glands 

 marking many of the vein apices as in S. violacea; sporangia very 

 dark brown; indusium narrow, early deciduous, brittle, and very 

 irregularly lacerate. [Plate 29.] 



Type in the U. S. National Herbarium, no. 575810, 57581 1, 

 and in the New York Botanical Garden, collected on moist banks 

 on the trail in the vicinity of La Palma, Costa Rica, altitude 

 1,450-1,550 m., William R. Maxon.435, May 6-8, 1906. 



The type of S. Christii is from Costa Rica, but S. vivipara is 

 evidently a very different plant. The following differences be- 

 tween the specimen mentioned under S. Christii (from Christ's 

 herbarium) and S. vivipara may be noted: 5. vivipara is oblong in 

 shape and not reduced at the tip, the single specimen of 6 1 . Christii 

 is ovate-lanceolate and gradually reduced at the tip; in S. vivipara 

 the stipe and rachis are almost scurfy in appearance, owing to 

 the fine, amorphous character of the wholly appressed scales; in 

 Christ's sheet the scales are mainly definite, at least I cm. long, 

 and appressed only at their bases, the stipes looking much like 

 very scaly S. lineata stipes. The viviparous character may not 

 prove constant, but it appears in each of the five fronds seen. 



25. S. Werckleana (Christ) Broadh. comb. nov. 

 Lomaria Werckleana Christ, Bull. Boiss. II. 4: 1091. 1904. 

 Blechnum Werckleanum C. Chr. Ind. Fil. 161. 1905. 



Plants terrestrial. Rhizome apparently subarboreous, the 

 scales linear, 2.5-3 cm. long, shining, rigid, erect, with a darker 

 center, tobacco brown to umber. Sterile fronds 1 15-140 cm. long; 

 stipesf 58 cm. long, but slightly angulate, usually marked to the 

 base with vestigial pinnae, the scales like those of the rhizome but 

 smaller and soon deciduous; lamina 83-110 cm. long, 15-25 cm. 

 wide, narrowly oblong, the base abruptly reduced (type A, with 

 vestigial pinnae), gradually reduced at the apex, the rachis 

 "spangled by scales" which are narrow, fibrillose, and mixed 

 with hoary ones, forming fine, webbed masses on the rachis; 



* See footnote under 5. violacea, p. 380. 



t All the following figures are the measurements of the only complete fronds seen: 

 two sterile fronds and one fertile one; they are Werckle's own specimens and from 

 Christ's herbarium. 



