SELAGINELLA FAMILY. 45 



3. Selaginella apus (L,. ) Spring. Creeping Selaginella. (Fig. 101.) 



Lycopodium afiodum L. Sp. PI. 1105. 1755. 



Sflaginella apus Spring in Mart. PI. Bras. I . 



Part. 2, 119. 1840. 



Annual, light green, stem* prostrate- 

 creeping, i'-4' long, much branched, flac- 

 cid, angled on the face. Leave* minute, 

 membranous, of 2 kinds, 4 ranked, pread- 

 ing in 2 planes ; upper leaves of the lower 

 plane spreading, the lower reflexed, orate, 

 acute, serrulate, not distinctly ciliate ; 

 leaves of the upper plane ovate, short-cus- 

 pidate ; spikes 3"-8" long, obscurely quad- 

 rangular; bracts ovate, acute, inmttinm 

 serrulate, acutely keeled in the upper half; 

 macrosporanges more abundant toward 

 the base of the spike. 



In moist shaded places, often among grass, 

 Maine and Ontario to the Xorthwc- 1 . 

 tory, south to l-'lorida. Louisiana and Texas. 

 Ascends to 2200 ft. in Virginia. July- Sept. 



Family u. ISOETACEAE. Underw. Native Ferns, 104. 



QUJXIAVORT FAMILY. 



r88i, 



Aquatic or marsh plants rooting in the mud, with a short buried 2-lobed or 

 3-lobed trunk (stem) sending out abundant roots and sending up a compact tuft 

 of rush-like leaves. Sporanges sessile in the axils of the leaves, some containing 

 macrospores (macrosporanges), others microspores (microeponages); th< 

 mer germinate into prothallia bearing only archegones, the latter into prothallia 

 "bearing usually only a single antherid. 



The family consists of the following genus only. 



i. ISOETES L,. Sp. PI. i loo. i 



Submerged, amphibious or uliginous plants with a cluster of elongated awl-shaped leaves 

 rising from a more or less 2-3-lobed fleshy short stem, the leaves with or without peripheral 

 bast-bundles, with or without stomata, bearing a small membranous organ (U^ule) above 

 the base. Sporanges sessile in the excavated bases of the leaves, orbicular or ovoid, the 

 sides more or less covered with a fold of the inner side of the leaf-base ( velum j. 

 sporanges of the outer leaves usually contain spherical, mostly sculptured macrospore*. 

 those of the inner ones contain minute powdery usually oblong microspores. 

 Greek, taken from Pliny, apparently referring to the persistent grceu leaves. ] 



About 50 species, widely distributed. Besides the following 2 arc known 

 United States, 7 from the Pacific Coast and 2 from Mexico. < >wni K to tlu-ir aqua 

 parently local distribution, these plants are popularly little known. The spor 

 and autumn. 

 Submerged or rarely emersed in very dry seasons ; leaves quadranjrular, without peripheral b 



bundles. 



Stomata wanting ; macrospores crested. 

 Leaves stout, rigid, scarcely tapering. 

 Leaves slender, tapering. 

 Stomata present ; macrospores echinate. 

 Amphibious or submerged only in earlier stages ; 



leaves. 



Peripheral bast-bundles wanting ; velum partial. 

 Leaves 2' -3' long ; macrospores with minute w 

 Leaves 4' -8' long ; macrospores with jagged crests. 

 Peripheral bast-bundles present ; macrospores honeyco 

 "Terrestrial ; stomata abundant on the triangular 1- 

 Leaves 15-60, usually black at the base. 

 Leaves 8-12, bright green, paler at the base. 



i / /. 

 stomata always present on the qi 



Hgrlmim 



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 i . 



