350 SELAGINELLE.'E. Sdaylndlu. 



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

 l)ack, bristle-tipped and ciliate : spikes strongly quadrangular ; niacrosporangia 

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

 — Gray, Manual, 5 ed. G75, t. 20; Mildu, Fil. Eur. et Atl. 2G0. 



Ou dry rocks, especially in inouiitiiiiious districts, not rare ; found in Anieiicii, Euroiie, Asia 

 and Africa. It picsfiits a variety of forms, stout and condensed, \ou<^ and slemler, with tlio 

 liristly appendaj^e of the leaves longer or shorter, etc. A cross-section of the stem shows a thick 

 layer of liiin ilark tissue surrounding the vascular a.xis. 



2. S. Oregana, Eaton, u. sp. Stems pendent, flaccid, 1 to G feet long, j)innately 

 much branched : leaves not glaucescent, loosely imbricated, scarcely a line long, 

 lineardanceolate, convex and grooved ou the back, acute but not bristle-tippeil, 

 sparsely spinulose-denticulate : s])ikes very slender ; macrosporangia scarce. 



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

 A. V. Kaulz, 1855, and in Tilamook Valley, Mrs. Smnmcrs, 1878. Veiy much softer than the 

 last, the spikes scarcely distinguishable from the sterile braiichlets. T^e 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 larfjcr leaves than the tivo ttjtjjer 

 ones, the branches seeniinijli/ fattened. 



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

 base of the InancliL-s ; branches 4 to G inches long, 2- 3-])innately ilivideil : lateral 

 leaves a line long, obliipiely oval, obtuse, faintly nerved; ui)per leaves half as long, 

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

 spikes terminal, quadrangular; bracts cordate-acuminate. — Li/cojwdium ovalifollum. 

 Hook, & Grev. Ic Fil. t. 177, not Uesv. L. DoiKjlasii, Hook. & Grev. ; Hook. Fl. 

 Eor.-Am. ii. 2G8. 



Oregon and Washington Territory, Douglas, Ifonphill, J. HowcU, et(!. Probably in Norlhein 

 California. This is llat-branched, like most of the species of the genus, and more like some troi>i- 

 cal forms than any other of the nortliern sjiecies. 



S. I.EPIDOI'IIYI.LA, Spring, from Lower California, Arizona, etc., is a nest-like ball when diy, 

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

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

 scarious-margined, tiiose of the ni)[)er rows scarcely smaller than the others. It is often called 

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



S. Califounkw, Spring, was collected by Dcpjie in Lower California, and is not known within 

 the limits of the Slate. It is a snntll jdantwith erect 3 to 4 times dichotomous branches, the 

 leaves in 4 rows ; lateral leaves une<inally ovate, obtuse, nnicronulate, miinitely denticulate on the 

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

 entire. 



2. ISOETES, Linn. (,>i;n.i.\voi:T. 

 Rushdike aquatic or littoral i)lants with a short solid cormdike stem, and long 

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

 infolded margins (the vdum) which enclose large siinjde ovcjid thin-walled sporocari)S 

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

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

 spores. 



Species very numerous, not less tlian 15 or 18 beiuf? known in the United States. Pending the 

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

 former writings. 



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

 \\ inches long) 4-angled, slender, tapering to a very fine i)oiiit, bright-green, soft, 

 ei)i<lermis-cells elongated, with stomata, but without jM'riplnnic bast-bumlles ; sporo- 

 carp mostly obK)ng, about u ipiarter or half covereil by the velum, unsixjtteil ; macro- 



