1005 



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 Ivs, 

 "Trunk bilobed. 



1. Velum partial or almost wanting. 

 ISOETES MELANOPODA J. Gay. 

 Al:32d. 



Variety CALIFORNICA A. A, Eaton. 

 Al:32 fdr. 



Variety PALLJDA Engelmann. 

 Al:32 fdr. 

 I: MARITIMA Underwood. 



Monoecious; trunk sm, only slightly 

 bilobed; Ivs 8-15, rigid, g, %' long, % to 

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

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

 covered by velum; ligule small; ma- 

 crospores 0.42-0.48 mm thick, 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). 

 I: BUTLERI Engelmann. 



Dioecious; trunk sub-globose; Ivs 8- 

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

 com oblong, 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. 

 IiKUTTALLU A. Braun. B2:351. 



Trunk almost globose, slightly groov- 

 ed; Ivs 20-60, slender, bright g, 3-9' Ig, 

 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. 

 opaca Nuttall. 



**Trunk trilobed; velum complete. 

 I: STJXSDOBFII Baker. 



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

 arcuate, deeply channelled, along the 

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

 sporangia orbicular, 2" long and broad; 

 ligula 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. 



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



Al:31d. 



I: DODGEI A. A. Eaton. 



I: EATONI Dodge. 



I: PGVEOLATA A. A. Eaton. 



I: MACOUKII A. A. Eaton. 



I: MINIMA A. A. Eaton. 



ISOETES ORCUTTII A. A. Eaton. 



Al:33 fdr. 



1006 



Species not American, but cited in our 

 literature. 



GARDNERIANA A 1:34. 



GUNNH. A 1:34. 



HOOKEBI A 1:34. 



HOWEI.LH A 1:33. 



MULLERI A 1:34. 



NIGRITANA A 1:34. 



3 AC GEAR AT A E, Parry Wyo 24. 

 I STTJABTI A 1:34. 

 I. WELWITSCHU A 1:34. 



SEIiAGINELLACEAE. 



SELAGINELLA Beauv. 



The only genus known in the order, 

 largely tropical, containing over 301 

 species. 



Sect'io 8 n EUSELAGINELLA. St Ivs of 1 

 kind, many-ranked; bracts uniform. 

 *Sts prostrate or spreading, somewhat 



S. S RT7PESTRIS Spreng. B 2:350. Da 20. 



Br 1:^05 Cruz. A l:380d. 



Al'380d. 



Sts densely tufted, prostrate or as- 

 cending, much-branched, 2-12' long; Ivs 

 appressed-imbricate, linear to linear- 

 lanceolate, convex and sulcate dorsaliy, 

 rigid bristle-tipped, ciliate; spikes 

 strongly quadrangular, 6-12" long; spor- 

 angia of both sorts in the same axils; 

 macrosporangia abundant; bracts ovate- 

 lanceolate. New England to Fla; Texas, 

 Cal; north. Synonyms: Lycopodium 

 rupestre L. L. bryopteris Wall. 

 Variety TORTIPII.A Underwood. 



Lvs sub-entire, gibbous dorsaliy near 

 apex; terminal bracts tipped with a long, 

 twisted, w awn; macrospores loosely 

 reticulate. NC; SC. 

 Variety PENDLEBI Underwood. 



Description not seen. 

 S: SELAGIBTOIDES Link. 



Sterile sts prostrate or creeping, 

 small and slender; fertile sts thicker as- 

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

 acute, spreading, sparsely spmulose-ci- 

 liate; bracts lax, ascending, lanceolate 

 or ovate-lanceolate, strongly ciliate. 

 Greenland; NH to Colo. Synonyms: S. 

 spinosa Beauv. Lycopodium selagm- 

 oides L. L. ciliatum Lam. 

 **Sts pendent, flaccid. 

 S OBEGANA Eaton. B 2:350. 



Sts 1-6 long, pinnately much branch- 

 ed; Ivs loosely imbricate, scarcely 1 

 linear-lanceolate, convex and grooved on 

 back, acute, sparsely spinulose-denticu- 

 late not bristle-tipped; spikes quadrang- 

 ular, very slender; macrosporangia 



lection STACHYGYNAOTBTIM Baker. 

 St Ivs 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; Ivs rigid, firm In 

 texture. 

 S. DOUGLASII Spring. B 2:350. 



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

 6' long bi-tri-pinnately divided; Ivs of 

 lower plane 1" long, obliquely oval, ob- 

 tuse, faintly nerved; Ivs of upper plane 

 % as long, oval, incurved, ending in a 



