99. EQTJISETUM^, Xmn^. 



§ 1. HIPPOCHAETE. 



(2) E. dcbile, Rb.; E. virgatum, BL, Hassk., Plant. Jav. Ran, 1. 



(3) E. tcn^gercnse, Bochr., in Ann. Cons. Gen., XV — XVI, 223. 



Stems numerous, erected, rigid, simple (i. e. branched in the sub- 

 terraneous lower part only), to 60 cm. long, ^/^ — 2 mm. thick, glaucous, 

 smooth, with a very large central hollow; vascular bundles encircled by 

 an own endodermis*) ; ribs 8 — 10, convex, narrower than the grooves; 

 grooves provided with series of stomata consisting of 1 line of pores and 

 series of very minute rosulae. Sheaths short, cylindrical, sometimes 

 encircled by a brown ring at the base, the teeth persistent, black, much 

 acuminated, sparingly piloso-denticulate towards the apex, separated from 

 the tube by a black ring; ribs as in E. debile Bb. Spikes 



Java. 



{') See Hochreutiner's information, 1. c, 224. 



