202 CHARA: AUSTRALES ET ANTARCTIC. 
and oe and larger seeds. The nut of the seed is about .50 m. 
long, and .40 m. thick. The presence of a weak incrustation can be 
seen when exposed to hydrochloric acid arising out of carbonic acid. 
17. Ch. Preissii ; dioica, rigidiuscula, diaphana ; caule stricto corticato, 
aculeis sparsis elongatis armato; verticillorum foliis 9-10, omnino 
ecorticatis, 5-artieulatis, articulo ultimo attenuato foliola geniculum 
imum coronantia non superante; foliolis in omnibus foliorum 
geniculis verticillatis, quam semina duplo longioribus ; stipulis duplici 
oliorum numero, elongatis, coronam simplicem verticillo appressam 
formantibus ; seminibus solitariis, fasciis circiter 11. 
Ch. Preissii, 4. Br. in Linnea, 17, p: 118. Plant. Preiss. 2. p. 147. 
B. microptila, aculeis, stipulis et foliolis brevioribus, ventricosis. 
von Hiver, Preiss ; Swan River, Drummond No. 2, in herb. Hook. 
Var. 8. Swan River, Drummond, No. 3, in herb. Hook. 
In this species by application of hydrochloric acid no carbonic acid 
appeared. The nut of the seed is without the calcareous covering 
peculiar to the greatest part of the true Chare. Length of the nut 
.48 m., thickness .32. 
18. Ch. Zlookerii; dioica, rigidiuscula, diaphana; caule stricto corti- 
cato, aculeis subverticillatis brevibus ventricosis cuspidatis armato; 
verticillis concatenatis e foliis 10—11, 4-articulatis, articulo 
ultimo attenuato foliola geniculi ultimi superante ; foliolis in omnibus 
foliorum geniculis verticillatis, e lata basi cuspidatis, erectis, quam 
antheridia (et semina?) multo brevioribus; stipulis duplici foliorum 
numero, abbreviatis, ventricosis, coronulam simplicem gibboso-ven- 
tricosis, coronulam simplicem verticillo appressam formantibus; an- 
theridiis solitariis ; seminibus. . 
Van Diemen's Land, Gunn, 1832, No. 1001, in herb. Hook. 
This species is distinguished by its peculiar habit. The stems are 
almost simple, the numerous whorls of short and somewhat ineurved 
leaves form a long chain. From the preceding species it chiefly differs 
in the short and tumid prickles, foliola, and stipule, which are finely 
acuminated. The female plant is wanting in Sir William Hooker's 
collection. 
* gymnopodes, foliorum articulo infimo ecorticato, sequentium 
nonnullis cortieatis. 
To this division belongs Ch. Hydropitys, Reichenb., inhabiting East India and 
South America. 
