CRYPTOGAMIA. 
651 
730. HYMENOPHYLLUM. Sorus marginalis, recepta- 
culo cylindraceo insertus. Indusium bivalve, sorum 
includens. 
V. HYDROPTERIDES. 
737* ISOETES, Capsula membranacea, non dehiscens, 
frondis basi immersa, 1-locularis. angulata, 
receptaculis pluribus filiformibus inserta. 
/38. SALVINIA. Indusia imbricata, connata, capsulam 
' unilocularem mentientia. Semina receptaculo cen- 
trali inserta. 
739 . AZOLLA. Capsula unilocularis, radicalis, g)obosa, 
polysperma. 
I. GONOPTERIDES. 
/• 
713. EaUISETUM. Gen.pl. 1614 . 
1. E. caulibus sterilibus simpliciter ramosis, ramis scabrius- 
culis tetragonis, fructificationibus simplicibus, vaginis 
cylindraceis inciso-dentatis, dentibus acutis. Willd. 
enum. 1005. IFilld. sp.pl. 5. p. 1. 
Icon. Schkuhr fdic. t. lOj . 
In low and sandy fields : Pensylvania and Virginia. 7/ . 
April, May. v. v. 
2. E. caulibus sterilibus fructificantibusque duplicato-ramo» 
sis, ramis scabriusculis deflexis tetragonis, ramulis 
subtriquetris. Willd. enum. 1005. Willd. sp. pl. 5. 
p. 3. 
Icon. Schkuhr fillc. t. 100. FL dan. 1182, 
In low shady woods : New York to Virginia. 7/ , April 
— June. V. V. 
3. E. caulibus subramosis, ramis subquaternis tetragonis 
glabris, spica cylindracea terminali. — Willd. sp. pl. 5. 
p. 4. 
In swamps : New York to Virginia. 7/ . May. v. v. 
Resembles E. limosum. 
4. E. caulibus simpliciter ramosis glabris sulcatis, ramis 
pentagonis apice spiciferis. Willd. enum, 1005. 
Willd. sp. pl. 5. p. 5. 
arvense. 
sylvaticum. 
uliginosum. 
4T 
palustre. 
