596 



CXII. MARSILEACE^. 



\^Isoetes. 



Ord. CXII. MARSILEACEzE R. Br. (Tab. XII. f. 2, 3 ) 



Capsules without a ring, within involucres that are situated 

 near the root of the plant. Ar[uatics. 



h 



1. IsoETES. Involucres formed by the swollen bases of the leaves 



2. PiLULARiA. Involucres arising, but distinct from, the base of the 



leaves. ^ 



h 



1. IsoETES Zinn. Quill-wort. (Tab. XII. f. 2.) 



Involucres formed by the swollen base of the leaves, 1 -celled. 

 Seeds or sporules of two kinds, inserted upon many filiform re- 

 ceptacles. — ISTamed from laog^ equal or alike^ and erog^ the year 

 or ever-green. ' 



L L Lacustris L. (Europcean Q.) ; leaves subulate blnnfl.r 



4-ano-ular of 4 longitudinal internally jointed tubes. 

 t. 1084. -^ ^ 



E.B. 



Bottoms of lakes in the north of England, Wales and Scotland.— 

 A very singular aquatic ; its fructification being entirely concealed 

 at the base of the cellular subulate leaves. Mr. W. Wilson finds 2 

 vars. In Wales ; the one densely tufted, with slender erect leaves ; the 

 other solitary, and with broader leaves widely spreading, 

 the former be the L setacea of Bosc ? 



May not 



2. PiLXJLARiA Linn. Pill-wort. (Tab. XII. f. 3.) 



'" Involucres solitary, nearly sessile, globose, coriaceous, 4-celled; 

 each cell containing 2 different kinds of bodies, one a membrane 



Name : pilula, a little pill, which its 



E.B.t. 521. 



gram or capsule (f. 3. Ji.). 

 fructifications resemble. 



1. '^<. globuUfera L. {cr 



Margins of lakes and pools, and in places that are partially over- 

 flowed. — Stems creeping, long, and entangled. Leaves setaceous, 

 erect, 2 or 3 from one point, 4-5 inches long. Involucres 2.1 X\x^ 

 base of the leaves, about the size of small peas, brown, downy on the 

 outside. ^ 



I 



( 



t 



Orb. CXIII. EQUISETACE^ Be Cand. (Tab. XII. f. 4.) 



Fructification terminal in spikes or catkins, consisting of peltate 

 polygonous scales, on the underside of which are from 4-7 

 involucres, jihich open longitudinally and contain numerous 



- globose bodies enfolded by 4 filaments clavate at their ex- 

 tremities. 



