NATUKAL SYSTEM. 191 



488. COHORT 2, I. Equisetacae (Horse Tails). Stem 

 straight, simple or branched, cylindrical, channeled ; 

 stiff-jointed ; sheathed at the joints ; tops of the 

 sheaths toothed. From Latin equus, a horse, and seta, 

 a bristle or hair ; Equisetum, scouring rush. 



489. COHORT 3, J. Filicinae. Ferns proper. Stem 

 a horizontal creeping rhizome, sometimes erect ; foli- 

 age pinnate or variously divided ; veins forked ; fructi- 

 fication on the back or edge of the frond. Name from 

 Latin filix, a fern ; Osmunda, Flowering Fern. 



THE FOLLOWING- FIVE CLASSES 



are not treated in this book, and therefore will be 

 briefly noticed only. 



490. CLASS II. Bryophyta. Mosses and their allies 

 (Greek ftwov, a moss, (pvrov, a plant). 



Sub-class 1. Hepaticse, Liverworts. 

 Sub-class 2. Musci, Mosses. 



491. CLASS III. Carpophyta. Spore-fruited plants 

 (Greek Kaprrog, fruit, 0vrov). 



Sub-class 1. Coleochaetese, Green fresh-water plants 

 with few spores. 



Sub-class 2. Floridese, Red or purple marine plants. 

 Sub-class 3. Ascomycetes, Parasites, spores in sacs. 

 Sub-class 4. Basidiomycetes, Spores on stalks. 

 Sub-class 5. Characea3, Green fresh-water plants. 



492. CLASS IV. Odphyta. Plants with egg-shaped 

 spores (Greek wov, an egg, and fyvrov). 



Sub-class 1. Zoosporae, Spore cells locomotive. 

 Sub-class 2. CEdogonieae, Thread-like cellular body. 

 Sub-class 3. Cceloblastese, Thread-like tubular body. 

 Sub-class 4. Fucacese, Large, color olive green. 



493. CLASS V. Zygophyta. Unisexual plants (Greek 



