1 20 OUK NATIVE FERNS AND THEIR ALLIES. 



conspicuous or wanting; sori, lo in each valve. {M. fiiacropus 

 A. Br.) Texas, New Mexico. 



** Sporocarps i (^rarely 2) 07i 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 15 — 30 mm. long, 2 — 4 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 {Reverclio/i). 



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 ; palese varying from 

 soft, dense and spreading to short and appressed, in mucj onata 

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

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

 kansas (Nultall), Kansas ( Watson), Texas, Arizona {Le?n!non), 

 California. Nevada (IVa/son), Oregon {Hall), Washington, Mon- 

 tana Watson), Dakota (AY^fl//^'/'), Y\onA^ {Underwood) 



Var. tenuifolia (Engelm.) Unde. & Cook. Plant 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 — II in each valve. {M. tenuifolia Engelm. and former 

 edition.) Pierdenales, Texas {Lindheimer), Western Texas 

 ( Wright). 



il. PILULARIA L. Pll.LWORT. 



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 setiform, I'long; sporo- 

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



