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170 ABOUT HORSETAILS, [cHaP. 
But from one of the cells a number of little processes 
are given off, and from the centre of these a bud, like 
the growing point 
of an adult stem, 
arises, and gradu- 
ally produces a 
ee new plant, with 
stemand branches, 
roots and reproductive organs complete. In fig. 128 
S is the detached sporangia, which has given rise to 
the pro-embryo P.Em, with its root R, and bud B. 
It should be noted that in Chara there are no 
vessels. The whole plant is built up of cells, each 
being originally of the simple form of cells, but some 
of them becoming ultimately modified. Thus the 
antherozoids are at first simple cells, becoming modi- 
fied for a special purpose. 
Erom the simple character of the organisation in 
these plants, the order occupies a low position in the 
classification of flowerless plants. Their place is be- 
tween the Crystalworts (Ricciacee) and the Alge. 
It remains for us to notice the British representa- 
tives of an order called MWarstleacee, or Pepperworts. | 
There are but three British species, one of these— 
Isoétes Moorei—having been discovered by Dr. Moore, 
as recently as 1879, in Upper Lake, Bray, co. Wick- 
low. 
The English species are but two, each belonging to 
a different genus. They are both aquatic plants. 
Tsoétes lacustris, the Quillwort, or Merlin’s Grass, 
grows on the bottoms of lakes, being completely sub- 
merged, when it has the appearance of grass. The 
stem or root-stock is globular in form, and gives 
