NATURAL CLASSES. 65 



16. OsARiTiA, diff. Sphanidia or Rubiacea 

 by fruit unilocular or monosperm, types Sambu- 

 cus. Viburnum, Valeriana. 



17. Cynaridia, diff. Flosculia by style arti- 

 culated, flowers often irregular, types Cynara, 

 Echinops, Gundelia. 



1.8. Synodia, diff. Codanthia by flowers ag- 

 gregated with a phoranthe and perianthe, types 

 Jasione, Opercularia. 



19. Cactidia, The Cactus family and akin 

 genera Mesembryanthus, Tetragonia, hardly 

 distinguished except by fleshy substance, many 

 petals, ovary adherent, fruit polysperm. But 

 Ribesides and Myrtides, Begonia and Escalo- 

 nla, are very near with a different habit. 



20. Vaccinidia, this small family of mine may 

 become an order also, being very distinct from 

 the next orders Campanulea and Cucurbitacea : 

 by far more akin to Ribesides and Cactides 

 only differing by the single style and corolla 

 peripetal not staminiferous. 



EXOGENIA. 



21. Calicinia, diff. from Emprotia by a true 

 perigone, types Dracontium, Orontium, Typha, 



LARNAGENEA. 



22. Thalaria, diff. from Lichenia, by having 

 a real stem called thallus, types Cladonia, 

 Stereocaulon, Usnea. 



23. Byssidia, the filamentose Fungides, types 

 Byssus, Conoplea, Monilia. 



24. Geramidia, diff. from Confervides, fruc- 

 tification external, types Ceramium, Ectosper- 

 tnia, Char a. 



25. Stereopsia, diff. from Fucidia and the 

 Ulvinia division by havinaf nothing like stem 

 nor frond, types Rivularia, Physidrum, Spongia. 



These 2.1 new orders added to my 66 of 1815 



15 



