10 



20 



appressed, lanceolate, mueronate, entire, 

 apparently terete; spikes cylindrie, soli- 

 tary, with cordate, acuminate bracts. 

 NY; NJ; north and west. Synonyms: 

 L. alpinum Michx.— L. armatum Desv. 

 •♦'Fertile branches with minute lvs, so 

 that the spikes appear long-peduncled, 



I. — Lvs uniform, many-ranked; sts 

 terete. 



L: GLAVATUM L. 



Running-pine. Sts extensively creep- 

 ing; branches similar, ascending, short 

 and lfy, the fertile terminated by a 

 slender peduncle bearing 1-4 linear, 

 cylindrie spikes; Ivs much-crowded, 

 linear-awl-shaped, tipped like bracts 

 with a fine bristle. Canada; NC; Wash; 

 Alk. Synonyms: L. officinale Neck.— D. 

 vulgare Vaill. — L. inflexum Swz.— L, 

 serpens Presl.— -Lepidotis inflexa Beauv. 



II. — Lvs of 2 forms, few-ranked; sts 

 flattened. 



Z»: CABO^lK'XANljM L. 



Sterile sts and their few short, 

 branches entirely creeping; lateral lvs 

 broadly lanceolate, acute, and somewhat 



somewhat elongate; macrospores, 0.5-0.* 

 mm In diam, marked all over with dis- 

 tinct or somewhat confluent crests; mi- 

 crosperes smooth, 0.055— 0.048 mm long, 

 NY;"NH; Mass; Vt. 

 Variety &Am®nCWLA Engeimann. 



Lvs fewer, shorter, thinner; spores 

 smaller, microspores somewhat granu- 

 late, 0.026-0.036 mm long*. Synonym; I. 

 macrospora Durien. Grand Lake, Middle 

 Park, Colo (Engeimann): Castle Lake, 

 near Mt Shasta, Cal (Pnngle), 

 I: PYGMAEA E. B2:351. , 



Lvs 5-10, stout, rigid, bright g, Va-l 

 long, abruptly tapering to a fine point, 

 with very short often almost square epi- 

 dermal cells; sporangia orbicular with a 

 narrow velum; macrosperes 0.36-0.5 mm 

 thick, marked with minute, rather regu- 

 lar, distinct or rarely confluent warts; 

 microspores brown, almost smooth, 

 0 024-0.029 mm long. Mon Pass, Cal. 

 (Bolander). ^ 

 ti TirCKERMANl A. Br. 



Lvs 10-30, very slender, tapering, 

 olive g 2-3' long, outer recurved; spor- 



oblique, 1 -nerved, widely spreading in 2- angia mostly oblong, w or rarely brown- 

 ranks; upper row of lvs shorter, ap- spotted, upper third covered by tb"? 

 pressed; peduncle simple, slender, 2-4' velum; macrospores 4.44-0.56 mm tmc.<* 



hi, clothed with small bract-like lvs 

 bearing a single cylindrie spike. NJ; 

 Pla; Ala; La. Synonyms: L. repens 

 Swz. — L. affine Bory, — Lepidotis repens 

 Beauv. 



L:COMFLANATUM L. 



Sts extensively creeping, with erect 

 or ascending fan-like branches several 

 times forked above; branchlets crowded, 

 flattened; lvs minute, imbricate-appres- 

 sed, 4-ranked; lateral rows with some- 

 what spreading tips; intermediate 

 smaller, narrower, wholly appressed; 

 peduncle slender, bearing 2-4 cylindrie 

 spikes. New England; NC; Mich; north- 

 ward. Synonyms: L. thyroides Humb & 

 Bonpl. — L. tristachyon Pursh.-— L. an- 

 ceps Walls.-— L. ehamaecyparissus A. Br. 

 ■ — Lepidotis complanata Beauv. — Some 

 botanists unite Lyeopodium alpinum L. 

 and L. sabinaefolium with this -species. 



Descriptions of the following species 

 have not been seen by the writer. 



ADPEES3UM (Chapm) Lloyd and 

 Underwood. 



Z,: CHAjytAECyPARISSXTS A. Br. 

 7,: PIHNATUM (Chapm) Lloyd and Un- 

 derwood. 



Based on L. inundatum pinnatum? 

 '.£,: POSOPHILITM Lloyd and Under- 

 wood. 



SITCKENSE Rups. 



ISOETACEAE. 

 Genus ISOETES Linnaeus. 



Quillwort. About 50 species. 

 Section I. Submerged, rarely above 

 water in driest seasons; lvs quadrangu- 

 lar, without peripheral bast-bundles; 

 velum incomplete. 

 *Stimata absent. 

 I: LACTJSTEIS L. 



Lvs 10-25, stout, rather rigid, obtusely 

 quadrangular, acute but scarcely taper- 

 ing, dark or olive-g, 2-6' long; sporangia 

 orbicular — broadly-elliptic, with a nar- 

 row velum; ligula triangular, short or 



the upper segs marked With proinine.it, 

 somewhat parallel and branchy g" r dgej, 

 lower half reticulate: . microspores 

 smooth or nearly so, 0.026-0.032 mm long, 



rfScHlETOSPOSA Durien, Soc bot Fr 



b One tif the smaller species, with 10 : 3O 

 or 40 soft bright g or sometimes r ish 

 lvs, gradually and regularly tapering 

 from a thick base to a very slender 

 elongated point absolutely without sto- 

 mata, 2-4 or sometimes 5' long; spor- 

 angia orbicular to broadly oval, un- 

 spotted with a narrow, erect, truncate, 

 or slightly forked spinules; microspores 

 0 03-0.034 mm long, almost smooth, 

 Italy, France, Germany, England, Lap- 

 land, Iceland, apparently not m America, 

 **Stomata present. 



Variety BSSATOII E, St. Louis ac tr 



4 'Rathe? small, with 13-15 g or fish-g, 

 erect or spreading, rather short (o-b 

 long), tapering soft Ivs, generally with 

 few stomata towards the tip only; spor- 

 angia orbicular to broadly elliptical* 

 spotted, generally V 2 or even % covered 

 by a broad velum; macrospores 0.4-0 5 

 mm thick, rather a little longer, covered 

 with broad, refuse spinules, sometimes 

 somewhat confluent, and then dentate or 

 incised at tip; microspores 0.026-0. 0o 

 mm long, smooth. Nova Scotia; New 

 England; Pa: Mich; Utah; Greenland. 

 Synonym: I. Braunii Durien, Soc bot Pr 

 b 11:101. 



Variety ROBTTSTA Engeimann. 



Similar to var. Braunii, but much 

 stouter, With 25-70 lvs, 5-8' long, with 

 abundant stomata all over their surface; 

 velum covering about V 2 of the large, 

 spotted sporangium; macrospores 0.36- 

 0.55 mm thick, with the sculpture and 

 miscrospores the same as of var. Bra- 

 unii. North end of Isle of La Mottev 

 Lake Champlain CC G. Pringle). 

 Variety BOOTTII Engeimann. 



