398 Benedict: Revision of the genus Vittaria 



possible according to natural relationships. V. minima, the 

 simplest of the species treated, belongs at the bottom of the 

 series, and is probably like the primitive form from which the 

 others have been derived. The remaining six species fall naturally 

 into two groups as indicated. 



In connection with the species-descriptions, complete citations 

 of the specimens examined are given. The letters following the 

 individual citations refer to the herbarium in which the specimen 

 is located. "U" represents the Underwood Fern Herbarium of 

 the New York Botanical Garden; "N" the National Herbarium 

 at Washington; "E" the Eaton Herbarium at Yale; "C" the 

 Herbarium of the Botanisk Museum of Copenhagen. 



Leaves 3-6 mm. long. 1. V. minima. 



Leaves more than 6 mm. long. 



Petioles 2-angled from near the base, lamina with a ventral 

 ridge along the midvein 

 Sporangial line 0.5-1 mm. from the margin, lamina 

 linear. 

 Lamina less than 1 cm. broad (4-7 mm.), the areolae 



longitudinal. 2. V. Gardneriana. 



Lamina usually more than 1 cm. broad, the areolae 



oblique. 3. V. remota. 



Sporangial line 2-3 mm. from the margin, lamina elliptic 



to lanceolate. 4. V. latifolia. 



Petioles terete or oval in section except near the top, lamina 

 without a ventral ridge. 

 Scales unicostate (rarely 2-3 costate), sporangia in two 



narrow deep grooves about 0.5 mm. from the margin. 5. V. stipitata. 

 Scales always pluricostate, sporangia in a shallow groove 

 1— 1.5 mm. from the margin. 

 Lamina 4-10 mm. broad, the margins parallel, scales 

 of the petiole longer and narrower than those of the 

 stem. 6. V. Ruiziana. 



Lamina 8-14 mm. broad, narrowed both ways from 



the middle, scales all alike, with heavy costae. 7. V. Williamsii. 



i. Vittaria mimina (Baker) Benedict, Bull. Torrey Club 38: 164. 



5 My 191 

 Antrophyum minimum Baker, Ann. Bot. 5: 448. 1841. 

 Hecistopteris minima Benedict, Bull. Torrey Club 34: 457. 19 



1907. 

 Antrophyum Werckleanum Christ, Bull. Herb. Boiss. II. 5: 11. 



1905. 



