350 SELAGINELLE^E. Sdayindla. 



cated and appressed, lanceolate, scarcely a line long, convex and grooved on the 

 back, bristle-tipped and ciliate : spikes strongly quadrangular ; macrosporangia 

 abundant, intermixed with the slightly smaller and more numerous microsporangia. 

 -Gray, Manual, 5 ed. 675, t. 20; Milde, Fil. Eur. et Atl. 260. 



On dry rocks, especially in mountainous districts, not rare ; found in America, Europe, Asia 

 and Africa. It presents a variety of forms, stout and condensed, long and slender, with the 

 bristly appendage of the leaves longer or shorter, etc. A cross-section of the stem shows a thick 

 layer of firm dark tissue surrounding the vascular axis. 



2. S. Oregana, Eaton, n. sp. Stems pendent, flaccid, 1 to 6 feet long, pinnately 

 much branched : leaves not glaucescent, loosely imbricated, scarcely a line loi.g, 

 linear-lanceolate, convex and grooved on the back, acute but not bristle-tipped, 

 sparsely spinulose-denticulate : spikes very slender ; macrosporangia scarce. 



Hanging from branches in dense masses, in moist forests ; Port Orford, Lieut,, (now General} 

 A. V. Kautz, 1855, and in Tilamook Valley, Mrs. Summers, 1878. Very much softer than the 

 last, the spikes scarcely distinguishable from the sterile branchlets. The cross-section of the 

 stem is very unlike that of the last species, and shows a much softer and nearly colorless tissue. 

 As it has been found within a few miles of the boundary of the State, there is scarcely a doubt 

 that it will be discovered within its limits. 



* * Leaves in four rows ; the lateral rows of larger leaves than the two upper 

 ones, the branches seemingly flattened. 



3. S. Douglasii, Spring. Stems decumbent, 6 to 24 inches long, rooting at the 

 base of the branches ; branches 4 to 6 inches long, 2 - 3-pinnately divided : lateral 

 leaves a line long, obliquely oval, obtuse, faintly nerved ; upper leaves half as long, 

 oval but incurved and shortly apiculate ; both kinds sparingly ciliate at the base : 

 spikes terminal, quadrangular ; bracts cordate-acuminate. Lycopodiiim ovalifoliitm, 

 Hook. & Grev. Ic. Fil. t. 177, not Desv. L. Douylasii, Hook. & Grev. ; Hook. El. 

 Bor.-Am. ii. 268. 



Oregon and Washington Territory, Douglas, Hemphill, J. Howell, etc. Probably in Northern 

 California. This is flat-branched, like most of the species of the genus, and more like some tropi- 

 cal forms than any other of the northern species. 



S. LEPIDOPHYLLA, Spring, from Lower California, Arizona, etc., is a nest-like ball when dry, 

 but when moistened expands and shows many pinnately compound branches disposed in a spiral 

 about a closely coiled central stem ; the leaves closely imbricated, ovate, obtuse, somewhat 

 scarious-margined, those of the upper rows scarcely smaller than the others. It is often called 

 " Resurrection-plant," and may possibly occur in the southern counties. 



S. CALIFORNICA, Spring, was collected by Deppe in Lower California, and is not known within 

 the limits of the State. It is a small plant with erect 3 to 4 times dichotomOus branches, the 

 leaves in 4 rows ; lateral leaves unequally ovate, obtuse, mucronulate, minutely denticulate on the 

 upper margin ; leaves of the intermediate rows five times smaller, ovate-oblong, subcordate and 

 entire. 



2. ISOETES, Linn. QUILLWORT. 



Rush-like aquatic or littoral plants with a short solid corm-like stem, and long 

 subulate cellular leaves, the bases of which are expanded and have thin stipule-like 

 infolded margins (the velum) which enclose large simple ovoid thin-walled sporocarps 

 or sporangia ; the outer ones containing large spheroid trivittate macrospores, and 

 those of the inner leaves filled with minute obliquely oblong and triangular micro- 

 spores. 



Species very numerous, not less than 15 or 18 being known in the United States. Pending the 

 publication of a new monograph by Dr. Engelmann, the following descriptions are taken from his 

 former writings. 



1. I. Bolanderi, Engelm. Trunk [stem] deeply 2-lobed : leaves (5 to 20, 2 to 

 4| inches long) 4-angled, slender, tapering to a very fine point, bright-green, soft, 

 epidermis-cells elongated, with stomata, but without peripheric bast-bundles : sporo- 

 carp mostly oblong, about a quarter or half covered by the velum, unspotted ; macro- 



