414 



II. FLOWERLESS PLANTS. 



Substance of the plant wholly of cellular tissue (except- 

 ing in the Subclass Ductulosa which has a few ducts). 

 No woody fibre. No true flower with stamens and pistils. 

 No distinct embryo nor cotyledons. 



Class III. 

 CEYPTOGAME.E DUCTULOS^B. 



Plants with a few ducts amongst the cellular tissue *. 



Order XCVIII. EQUISETACE.E. 



Leafless branched plants with a striated fistular stem, joints 

 sheathed above each joining. Sporules surrounded by elastic 

 clavate filaments and inclosed in capsules arising from the peltate 

 scales of terminal cones or spikes. Vernation straight. Cuticle 

 abounding in silex. Only one genus. 



1. EQUISETTJM Linn. Horse-tail. 



* Fertile stems mostly unbranched and succulent j barren stems 

 with whorled branches, appearing later. 



1. E. arvense (L.); sterile st. with few furrows slightly sca- 

 brous, branches rough with 3 or 4 simple angles, teeth of sheaths 

 long acute \-ribbed at the tip, fertile st. simple with few lax 

 distant sheaths. E. B. 2020. S. 1 . IV. 77- Sterile st. many, 

 procumbent or ascending ; with many whorls of roughish usually 

 simple branches, having 3- or 4-toothed sheaths; general 



1 (TV.) refers to Newman's History of British Ferns, ed. 2. (S.) to 

 Sowerby's Ferns of Britain and Fern-allies. Moore's Handbook of 

 British Ferns may be consulted with advantage. 



