CHRISTMAS FERN
Aspidium acrostichoides
[See No. [17]]
40. SPINULOSE WOOD FERN
Aspidium spinulosum var. intermedium
Very common, usually but not always large, fronds oblong-ovate, 2-3 pinnate, lowest pinnæ unequally triangular-ovate, lobes of pinnæ thorny-toothed. In woods everywhere. P. [166].
41. BOOTT'S SHIELD FERN
Aspidium Boottii
From one and a half to more than three feet high. Sterile fronds smaller and simpler than the fertile, nearly or quite twice-pinnate, the lowest pinnæ triangular-ovate, upper longer and narrower, pinnules oblong-ovate, sharply thorny-toothed. In moist woods. P. [168].