22 FAM. 4, 5, 6. 



D. (Aspidium) Floridana. Rootstock thick, scaly; blades firm, veins forked; 

 upper leaflets fertile, deeply cut into oblong segments; lower leaflets sterile, 

 broader, less deeply cut; indusia large, thin. On low grounds. 



D. (Aspidium) unita. Rootstock creeping, slender; blades pinnate, long, firm, 

 with the pinnae pinnatifid-lobed ; lower veins of contiguous lobes united. 

 Moist thickets. 



Aspidium tsussimense is a dwarf fern cultivated in fern dishes, — Other cultivated 

 ferns are the Gold- and Silver-ferns, Gymnogramma, named for the yellow 

 or white wax-like powder that covers the under surface of the leaves; — 

 the Tree-ferns, Cyatheaceae; some with the sori at the end of the veins, 

 Cibotium, of which C. schiedei has a caudex and C. barometz has not; 

 some with the sori on the back or in the axils of the veins, of which Alsophila 

 australis, Australian Tree-fern is the type; — the Climbing ferns, Lygodi- 

 um, of which L. scandens is best known. 



4. Lycopodiaceae, Club-moss Family. 



Moss-like plants with mostly creeping stems and nar- 

 row leaves in 2-several rows; sporanges in the axils of the 

 bracts forming compact cones. 



Leaves in 4 or more rows; spores sulphur-yellow; in our species the cones 



terminal. In sandy bogs or on low pine-land, - Lyco podium Club. Moss. 

 1. Sporanges globular, leaves and bracts alike, ______ 2 



1. Sporanges compressed, leaves and bracts unlike, ----- 4 



2. Bracts slightly toothed at the base, ------ L. Chapmani 



2. Bracts twice as long and much toothed at the base, ------ 3 



3. Stems arching, leaves in many rows, spreading, hairy; bracts 



not hairy, -_-___-- L. alopecuroides 



3. Stems prostrate, leaves in one plane, ----- L. pinnatum 



4. Stems arching, leaves in 5 or more rows, cones numerous, nodding, L. cernuum 

 4. Stems prostrate, leaves nearly in one plane, L. Carolinianum 



6. Psilotaceae, Psilotum Family. 



Slender plants with sporanges sessile in the axils of 

 the leaves. 



Psilotum nudum (triquetrum) . Stems forking; triangular; leaves mere scales, 

 alternate; sporanges spiked. In hammocks, sometimes epiphytic. 



6. Selaginellaceae, Selaginella Family. 



Moss-like plants with much branched stems, scale- 

 like leaves, and one-celled sporanges arranged in four- 

 angled, axillary spikes or cones. 



1. Stem-leaves of two kinds in two planes, - - 2 



1. Stem-leaves of the same kind, several-ranked, - 3 



2. Stems flaccid, creeping, pale green, S. apus. Low shady woods 



2. Stems rigid, ascending, dark green, - - - S. Ludoviciana. Shady ground 



3. Stems creeping, rooting throughout, S. rupestris. Pine barrens 

 3. Stems ascending or erect, slender, - - S. arenicola. Sandy fields 



