124 OUR NATIVE FERNS AND THEIR ALLIES. 



conspicuous or wanting ; sori, 10 in each valve. (M.macropus 

 A. Br.) Texas, New Mexico. 



** Sporocarps I (rarely 2) on each peduncle. 



3. M. uncinata A. Br. Plant 6 20 cm. high ; leaflets 

 nearly smooth, entire, 10 16 mm. long ; sporocarps 6 mm. wide, 

 8 mm. long ; peduncles 1530 mm. long, 24 times the length 

 of the sporocarps ; raphe long, terminating in two approximate 

 teeth, the upper longer and mostly uncinately curved ; sori, 

 13 14 in each valve. Western Louisiana (Hale), Dallas, 

 Texas (Reverchoii). 



4. M. vestita Hook. & Grev. Plant 3 6 cm. high ; leaf- 

 lets entire or slightly toothed ; sporocarps 4 7 mm. long, 3 5 

 mm. wide ; raphe short, lower tooth short and blunt, the upper 

 acute, a little longer, sometimes curved ; paleae varying from 

 soft, dense and spreading to short and appressed, in mucronata 

 forms, where it is sometimes wanting ; sori, 6 11 in each valve, 

 a very variable species. (Includes M. mucronata A. Br.) Ar- 

 kansas (Ntfttall), Kansas ( Watson), Texas, Arizona (Lemmori), 

 California, Nevada (Watson), Oregon (Hall), Washington, Mon- 

 tana Watson}, Dakota (Nicollet), Florida (Underwood). 



5. M. tenuifolia Engelm. Plant much more slender, 5 15 

 cm. high ; leaflets narrow (2 4 mm. wide), more or less falcate, 

 the apex often somewhat truncate and unequally toothed, 

 villose with appressed hairs ; sporocarps single, 5 8 mm. long, 

 4 5 mm. wide, the teeth divergent, subequal ; sori, 9 11 in 

 each valve. A rare species only once collected. Pierdenales, 

 Texas {Lindheimer}, Western Texas ( Wright). 



II. PILULARIA L. PILLWORT. 



Sporocarps globose, longitudinally 2 4 celled, dehiscent from 

 the apex; cells with parietal cushions bearing in the upper por- 

 tion microsporangia and below these numerous macrosporangia 

 containing solitary macrospores. Leaves filiform from a slender 

 creeping rootstock, the sporocarps subsessile or peduncled or 

 in the axils of the leaves. Named from Lat. pilula, a pellet. 

 Includes six species widely distributed. 



i. P. Americana A. Br. Leaves set if orm, I'long; sporo- 

 carps i ' in diameter, attached by the side to a short, descend- 



