i 26 Spinulose Fern 



to sessile, oblong-lanceolate, basal pair unequally deltoid-ovate: 

 pinnules diverging from secondary rachis at angle of about sixty 

 to usually a trifle less than ninety degrees, crowded or more 

 distant, alternate or opposite, mostly short-stalked or subsessile, 

 ovate-oblong, obtuse to acute, commonly subacute, pinnatifid or 

 pinnately divided, usually minutely, obscurely, and very spar- 

 ingly chaffy on under surface along midveins ; the inferior mostly 

 longest, in basal pinnae moderately elongate with the basal one 

 commonly shorter than the next: segments adnate-decurrent, 

 oblong or at least the larger ovate, on sides and apex serrately 

 toothed or lobed; teeth and lobes spinulose entire or spinulose- 

 toothed: rachises channelled on face, furnished, especially at 

 nodes of pinnae, sparingly with small or minute, linear or ovate, 

 acuminate, entire scales, secondary rachises very narrowly 

 winged: color commonly dark green: lower surface slightly 

 paler than upper, minutely glandular: glands unicellular, capi- 

 tate or cylindrical : texture firmly membranaceous. 



Venation pinnate, free, marked on face of blade by depressed 

 lines : each tooth of blade occupied by a veinlet : primary branches 

 of midveins of pinnules' segments each, excepting sometimes the 

 superior basal one, occupying a primary lobe or tooth of the seg- 

 ment, in the entire one simple, in the toothed bearing simple 

 branches ^qual in number to the teeth : veinlets clubbed at apex. 



Sori usually small, borne on primary branches, when these 

 are simple, of midveins of pinnules' segments ; when these branches 

 are compound, borne on their superior basal branches, dorsal or 

 subapical, the fertile veinlet mostly projecting beyond radius of 

 sorus: indusia whitish, delicately membranous, round-reniform, 

 bearing stalked and sessile glands, denticulate at margin. 



Spores muriculate. 



