2a 



24 



Section III. — Terrestrial species, matur- 

 ing entirely out of water, with abund- 

 ant stomata and peripheral bast-bundles, 

 thick dissepiments, and small air-cav- 

 ities in the nearly triangular lvs. 

 *Trunk bilobed. 



1. — Velum partial or almost wanting. 

 ISOETES MELANOPODA J. Gay. 



Al:32d. 



Variety CALIFORNICA A. A. Eaton. 



Al:32 fdr. 



Variety PALLIDA Engelmann. 



Al:32 fdr. 



I: MARITIMA Underwood. 



Monoecious; trunk sm, only slightly 

 bilobed; lvs 8-15, rigid, g, y 2 ' long, y 2 to 

 2-thirds li wide; sporangia oval, 2" lg, 

 1^4" wide, brownish w, 1-third to Va 

 covered by velum; ligule small; ma- 

 crospures 0.42-0.48 mm tnick, densely 

 spinulose, the spines blunt, rarely con- 

 fluent; -microspores smooth, w, 0.32-0.35 

 mm thick. In salt marsh, Alberni, Van- 

 couver Island (Macoun). 

 X: BUTX.ERI Engelmann. 



Dioecious; trunk sub-globose; lvs 8- 

 12, rigid, bright g, 3-7' long; sporangia 

 com oolong, spotted, with a very nar- 

 row velum or none; ligula awl-shaped 

 from a triangular base; macrospores 

 0.5-0.63 mm thick, marked with knobs or 

 warts, distinct or sometimes confluent; 

 microspores papillose, dark brown, 

 0.028-0.38 mm long. "In saline flats, 

 near Limestone Gap, Indian Territory." 

 Variety IMMACULATA Engelmann. 



Larger, with unspotted sporangia, and 

 spinulose microspores, the macrospores 

 0.4-0.56 mm. Cedar barrens near Nash- 

 ville, Tenn (Gattinger). 



II. — Velum complete. 

 I:NUTTALLII A. Braun. B2:351. 



Trunk almost globose, slightly groov- 

 ed; lvs 20-60, slender, bright g, 3-9' lg, 

 with only 3 peripheral bast-bundles; 

 sporangia oblong or oval, entirely cov- 

 ered by velum; macrospores variable, 

 0.25-0.5 mm thick, densely covered with 

 minute but rounded warts, or rarely al- 

 most smooth; microspores papillose, 

 brown, 0.025-0.028 mm long. Ore; Wash; 

 Idaho; Vancouver Island. Synonym: I. 



paca Nuttall. 

 ::: *Trunk trilobed; velum complete. 

 X: SUK3DORFII Baker. 



Lvs 12-20, firm, bright g, very slender, 

 arcuate, deeply channelled, along the 

 face, 2-3' long, less than y 2 " wide; 



porangia orbicular, 2" long and broad; 

 Hgula deltoid; macrospores grayish-w, 

 faintly granulated. Wash (Suksdorf). 



Other species of Isoetes within our re- 

 gion, are the following, of which descrip- 

 tions have not been seen by the writer, 

 except as noted. 



ISOETES MEXICANA Underw. 

 Urid, bot gaz 13:93, Chili; Z 1:98, 99, 101, 

 Vl:3ld. 



I: DODGEI A. A. Eaton. 



I: EATOKI Dodge. 



I: FOVEOLATA A. A. Eaton. 



X: MACOUNII A. A. Eaton. 



I: MlFIiVEA A. A. Eaton. 



ISOETES ORCUTTII A. A. Eaton. 



Al:33 fdr. 



Species not American, but cited in our 

 literature. 



X. GARDNERIANA A 1:34. 



X. GTJNNII. A 1:34. 



I. HOOKEBI A 1:34. 



X. HOWEI.LII A 1:33. 



I. MULLERI A 1:34. 



X. NIGRITANA A 1:34. 



X. SACCHARATA E, Parry Wyo 24, 



I. STUARTI A 1:34. 



X. WEI. WITSCHII A 1:34. 



SEI.AGINEI.I.ACEAE. 



SELAGTNEELA Beauv. 



The only genus known in the order, 

 largely tropical, containing over 300 

 species. 

 A l:380d. 



Section EUSELAGINELLA. St lvs of 1 



kind, many-ranked; bracts uniform. 

 *Sts prostrate or spreading, somewhat 

 rigid. 



S. RUFESTRIS Spreng. B 2:350. Da 20. 



Br 1:205 Cruz. A l:380d. 



Al:380d. 



Sts densely tufted, prostrate or as- 

 cending, much-branched, 2-12! long; lvs 

 appressed-imbricate, linear to linear- 

 lanceolate, convex and sulcate dorsaily, 

 rigid, bristle-tipped, ciliate; spixe* 

 strongly quadrangular, 6-12" long; spor- 

 angia of both sorts in the same axils; 

 macrosporangia abundant; bracts ovate- 

 lanceolate. New England to Pla; Texas; 

 Cal; north. Synonyms: Lycopodium 

 rupestre L. — L. bryopteris Wall. 

 Variety TORTIFIIiA Underwood. 



Lvs sub-entire, gibbous dorsally near 

 apex; terminal bracts tipped with a long, 

 twisted, w awn; macrospores loosely 

 reticulate. NC; SC. 

 Variety FENDLERI Underwood. 



Description not seen. 

 S: BEL AC, IX G IDES Link. 



Sterile sts prostrate or creeping, 

 small and slender; fertile sts thicker, as- 

 cending, simple, 1-3' hi; lvs lanceolate, 

 acute, spreading, sparsely spinulose-ci- 

 liate; bracts lax, ascending, lanceolate 

 or ovate-lanceolate, strongly ciliate. 

 Greenland; NH to Colo. Synonyms: S. 

 spinosa Beauv. — Lycopodium selagin- 

 oides L. — L. ciliatum Lam. 

 **Sts pendent, flaccid. 

 S. ORE G AN A Eaton. B 2:350. 



Sts 1-6° long, pinnately much branch- 

 ed; lvs loosely imbricate, scarcely 1" lg, 

 linear-lanceolate, convex and grooved on 

 back, acute, sparsely spinulose-denticu- 

 late, not bristle-tipped; spikes quadrang- 

 ular, very slender; macrosporangia 

 scarce. Ore. 



Section STACHYGYNANDRIXM Baker. 

 St lvs of 2 kinds, spreading in 2 planes, 

 those of upper plane smaller and more 

 ascending; bracts uniform. 

 *Main sts decumbent; rt fibres extend- 

 ing to upper nodes. 



I. — Sts persistent; lvs rigid, firm in 

 texture. 



S. DOUGLAS II Spring. B 2:350. 



Sts decumbent, 3-12' long; branches 2- 

 6' long, bi-tri-pinnately divided; lvs of 

 lower plane 1" long, obliquely oval, ob- 

 tuse, faintly nerved; lvs of upper plane 

 y 2 as long, oval, incurved, ending in a 



