LttOTOmkCEM, (GROUND-PINE FAMILY.) 911 



15. CYSTOPTERIS, Bernh. Bladder Fern. 



Sori roundish, borne on the back of a straight ^^^- '^•i^* 



fork of the free veins. Indusium cup-shaped, at- 

 tached by its base on the inner side (toward the 

 midrib), early opening at its free, external, jagged- 

 lobed margin, and soon withering and disappearing 

 — Tufted ferns, with 3-3-pinnate fronds, the lobes 

 cut. Stipe continuous with root-stock. 



C. fragilis, L. 71 .1 to .3; root-stock hori- 

 zontal. Fronds with long, yellow, polished stipes> 

 oblong-lanceolate, 2-3 pinnate ; pinnae and pinnules 

 ovate-oblong, the latter irregularly pinnatifid and 

 cut-toothed, decurrent on the marginal or winged ra- 

 chis — Summer — 



Var. teiiui§ecta. Boiss. Lobes of pinnules 

 narrower, and whole plant more delicate — Alpine 

 and subalpine Lebanon, Amanus, and northward. 



(a) Tip of frond of Cys- 

 topteris fragilis, chew- 

 ing mature fruit dots. 

 (6) An immature Iruit 

 dot, showing indusium. 

 3 diameters. 



Order CXXIV. 



I^YCOPODIACE^, D. 



Family). 



C. (GROUND-PiNE 



Stems alternately or dicliotomously branched, leafy, often 

 decumbent at base. Leaves persistent, (in ours) in 4 rows or 

 spirally arranged. Sporangia (in ours) in the axils of all 

 the leaves of fertile branches — Low, green plants. 



SEIiAOIXEIiliA, Spring. Selaginella. 



Sporangia of two kinds on the same spike, the lower obovate-spher 

 ical, with 3-4 cells, containing 3-4, large, 3-striate spores, the upper 

 with single, muriculate cells, containing numerous, minute spores — 

 Low plants, appressed to rocks with northern exposure, Fig. 441. 

 with (in ours) 4 rows of minute leaves. 



S. clenticulata, L. 71 Leaves ovate, cuspidate, 

 those of sterile flattened branches on the upper and low- 

 er and lateral aspects of branch, serrulate, the lateral 

 .0015 long, .001 broad, the upper and lower smaller, 

 more appressed. Bracts of cylindrical, solitary or twin, 

 .01 long spikes, smaller than sterile leaves, 4-ranked 

 around stem, longer, cuspidate — Summer — Rocks ; Tip of steriu 



along coast. branch of S.den- 



° ticulata. 



(a) Rootlet, 



