NATURAL CLASSIFICATION. 55 



Equisetiim, Saururiis, Zoster a,, Pothos, 

 Acorns, Tijpha. 

 2(1. Section Glumacea. No spadix, nor spa- 

 tha flowers glumaceous, fruit achena. 



53. CoRTODiA, the Culmiferous. Style single, 



stem commonly without articulations — 

 Types Carex, Cyperus, Fharifs, Olyra, 

 Nardus, 



54. AcHiRosiA, the Grasses, Styles 2 or 3, stem 

 articulated ; Types Agrostis, Avena, Ory- 

 za, Cinna. 



VIII. Class, the CRYPTIANS. 

 1st. Section. Pteridia, fructification sessile 

 capsuliform, not calyptrate. 



55. DicLiPTERiA, the Diclipters. fructification 

 bivalve or multivalve, commonly in spike 

 or axillary — 'Types Plananthus, Pilularia, 

 Ophioglossum. 



59. DoRsiFERiA, vel Filices, The Ferns or 

 Dorsifers. fructification globular opening 

 by pores or splits, commonly behind a frond 

 or on a root — Types Marattia, Schizea, 

 Asphnium, Salvinia. 

 2d Section. Phryganisia, Fructif. peduncu- 

 late calyptrate, uniform or tubuliform. 



57. iETHEOGAMiA, the Mosses, Fructif. calyp- 

 trate, stem leafy — Types Hypnum, Dicra- 

 num, Phascum. 



58. Hepatidia, the Hepatides. Fructif. uncov- 

 ered not calyptrate, stem or expansion fron- 

 dose — Types Marchantia. Riccia. 



IX. Class, the ALGIDIANS. 

 1st. Section, Lichenia, the terrestrial algas 

 or Lichens. 



59. Tremaria, the Tremians. Fructif. opening 

 by a pore or slit — Types Hypoxylon, Xylo- 

 ma, Verrucacia. 



