403 
II. FLOWERLESS PLANTS. 
Substance of the plant wholly of cellular tissue (except- 
ing in the Subclass Ductulose which has a few ducts). 
No woody fibre. No true flower with stamens and pistils. 
No distinct embryo or cotyledons. 
Class III. 
CRYPTOGAMEA DUCTULOSA. 
Plants with a few ducts amongst the cellular tissue’. 
Order XCVITI. EQUISETACEZ. 
Leafless branched plants with a striated fistular stem, articu- 
lations sheathed at their base. Sporules surrounded by elastic 
clavate filaments and inclosed in thece arising from the peltate 
scales of terminal cones.—Vernation straight. Cuticle abound- 
ing in silex. Only one genus. 
1. Eauisetum Linn. Horse-tail. 
* Fertile stems mostly unbranched and succulent ; barren stems 
with whorled branches. 
1. E. arvense (L.); sterile st. with few furrows slightly sca- 
brous, branches rough with 3 or 4 simple angles, fertile st. simple 
with few lax distant sheaths.—. B. 2020. N. 77.—Sterile st. 
many, procumbent or ascending, with numerous whorls of 
roughish usually simple branches having 3- or 4-toothed sheaths, 
each tooth long and acute with | rib extending to its end ; general 
1 Those who desire to obtain an intimate acquaintance with the 
British Ductulose are referred to Newman’s History of British Ferns, 
ed. 2, which is quoted (N.) in these pages. 
