13 



leaves lidear-awl-shaped, many ranked, crowded, incurved- 

 spriBading, tipped like the bracts with a fine bristle. Found in 

 the fall of 1885 in one spot near Iowa City by M. F. Linder. 



L. coMPLANATUM L. (Ground-Pine). Stems widely creep- 

 ing, branches erect, several times forked ; branchlets crowded, 

 flattened ; leaves 4-ranked, crowded, minute ; lateral rows with 

 spreading tips, the ihtermediate, narrow, appressed, bases de- 

 current, united; peduncle slender, bearing 2—4: cylindrical 

 spikes. Johnson county, Iowa. Local. M. F. Linder. 



■ ** y Spore-cases in the axils of the ordinary leaves. 



L. LUCiDTJLUM Mx. Stems ascending, branches 6 — 12 inch- 

 es long ; leaves in about 8 ranks^ lanceolate, flat, one nerved, 

 minutely toothed, at first spreading, then deflexed, arranged in 

 alternate zones of shorter and longer leaves ; the shorter leaves 

 usually bearing the sporangia in their axils. Reported from 

 Muscatine county by Mr. Reppert. 



Order 5. SELAGIN E LLACE JC. 



Moss-like plants, terrestrial or sub-aquatic, low, leafy ; leaves 

 small in 4 — 6 tows, or awl- shaped and elongated ; sporangia one- 

 celled, solitary, axillary. 



SELAGINELLA BEAUV. • 



Fructification spicate, of two kinds ; sporangia one-celled, sol- 

 itary, axillary, some containing reddish or orange colored pow- 

 dery microspores, and others containing 3—4 globose angular 

 maerospores. 



S. RUPESTRis Spring. Low, 2 — 3 inches, in prostrate or 

 erect, much branched tufts ; leaves all alike, closely appressed- 

 imbricated, linear to linear-lanceolate, minutely ciliate, bristle 

 tipped, rigid, convex and with a grooved keel ; the leaves of the 

 quadrangular spike broader ; the two kinds of sporangia in the 

 same axils. Found along the Cedar river in sandy soil among 

 clumps of Opuntia rafinesquii; Muscatine county ; local, Rep- 

 pert, 



Order 6. MARSILIACE^ R. Br. 



Perennial plants found in marshy places, rhizome creeping, 

 slender, leaflets usually four, terminating a long slender petiole. 



