26 FLORA. 



ish, erose-denticulate below, bearing in the axil a transversely oval sporange which 

 splits nearly to the base ; spores narrowly reticulate. In woods, Lab. to Alaska, 

 south to N. Car., Mich and Wash. Also in Europe, Asia and Cent. Am. 



10. Lycopodium Carolinianum L. (I. F. f. 97.) Sterile stems and their few 

 short branches creeping, closely appressed to the earth, 2.5-8 cm. long, emitting 

 numerous roots on the lower side. Leave of fertile stems of two forms, the lateral 

 ones broadly lanceolate, acute, and somewhat oblique, I -nerved, widely spreading, 

 in 2 ranks with a shorter, intermediate row appressed on the upper side ; peduncles 

 simple, slender, 5-15 cm. high, clothed with small bract-like leaves and bearing a 

 single cylindric spike ; bracts cordate, short-acuminate, mostly entire with trans- 

 versely oval sporanges in the upper axils. In moist pine-barrens, N. J. to Fla. and 

 La. near the coast. 



11. Lycopodium complanatum L. (I. F. f. 98.) Stems extensively creeping, 

 with erect or ascending fan-shaped branches several times forked above, with 

 crowded flattened branch lets. Leaves minute, imbricate-appressed, 4-ranked, the 

 lateral rows with somewhat spreading tips, the intermediate smaller, narrower and 

 wholly appressed, forming a flat surface; peduncle slender, 5-15 cm. high, dichotom- 

 ous, bearing 2-4 linear-cylindric spikes ; bracts broadly ovate, acuminate, the 

 margins pale and erose ; sporanges transversely oval, deeply splitting. In woods 

 and thickets, Newf. to Alaska, south to N. Car., Mich, and Br. Col. Also in Europe 

 and Asia. Forms with less distinctly dimorphous leaves and narrower, more erect 

 and bushy branches have been separated as var. Chamaecyparissus. 



Family 2. SELAGINELLACEAE Underw. 



Terrestrial, annual or perennial, moss-like plants with branching 

 stems and scale-like leaves, which are many-ranked and uniform, or 4- 

 ranked and of two types spreading in two planes. Sporanges i -eel led, 

 solitary in the axils of leaves which are so arranged as to form more or 

 less quadrangular spikes, some containing 4 macrospores (macrospo- 

 ranges), others containing numerous microspores (microsporanges), which 

 develop into small prothallia, those from the macrospores bearing arche- 

 gones, those from the microspores antherids. The family consists of the 

 following genus : 



i. SELAGIN^LLA Beauv. 



Characters of family. [Name diminutive of Selago, ancient name of a Lyeo- 

 podium.~\ About 340 species, widely distributed, most abundant in tropical regions. 



Stem-leaves all alike, many-ranked. 



Stems compact with rigid leaves ; spikes quadrangular. I. S. rupestris, 



Stems slender ; leaves lax, spreading j spikes enlarged, scarcely quadrangular. 



2, S. selaginoides. 



Stem-leaves of 2 kinds; 4-ranked, spreading in 2 planes. 3. S. apus 



1. Selaginella rupestris (L.) Spring. (I. F. f. 99.) Stems tufted, with occa- 

 sional sterile runners and sub-pinnate branches, 2.5-8 cm. high, commonly curved 

 when dry. Leaves rigid, appressed-imbricated, 2 mm. or less long, linear or linear- 

 lanceolate, convex on the back, more or less ciliate, many-ranked, tipped with a 

 distinct transparent awn; spikes sessile at the ends of the stem or branches, strongly 

 quadrangular, 12-25 mm - l n g> about 2 mm. thick ; bracts ovate-lanceolate, acute 

 or acuminate, broader than the leaves of the stem ; macrosporanges and microspo- 

 ranges borne in the same spikes, the former more abundant. On dry rocks, Me. 

 to Ont. and Br. Col., south to Ga., Mo. and Cal. 



2. Selaginella selaginoides (L.) Link. (I. F. f. 100.) Sterile branches creep- 

 ing, slender, 12-50 cm. long, the fertile erect or ascending, thicker, 2.5-8 cm. high, 

 simple ; leaves lanceolate, acute, lax and spreading, sparsely spinulose-ciliate, 

 2-4 mm. long ; spikes solitary at the ends of the fertile branches, enlarged, oblong, 

 linear, subacute, 2.5 cm. or less long, 4-5 mm. thick ; bracts of the spike lax, 

 ascending, lanceolate or ovate-lanceolate, strongly ciliate. On wet rocks, Lab. to 

 Alaska, south to N. H., Mich, and Colo. Also in N. Europe and Asia. 



