CHAEA. 
437 
— Opaque, greenish white, usually incriisted. St. covered with 
minute tubercles ; spines very many, sometimes few, upon the 
depressed primary tubes. Eranches long-, acuminate, of 7 joints, 
with 4 — 5 short bracts at each joining. — Ditches and pits. A. 
V. -VIII. E. S. I. 
14. C. tomentdsa (L.) ; dioecious (?), st. thickened upwards spi- 
rally sulcata rough brittle with scattered blunt tubercles, branch- 
lets incurved, bracts unilateral ovate-oblong mucronate-acute, 
nucule shorter than the bract on each side of it longer than the 
three in front. — C. latifolia \^'illd., Hook. Icon. 532.— Opaque, 
whitish gi-een. St. with minute, distant, rather whorled, short, 
blimt tubercles on the prominent primary tubes. — Belvidere 
Lake, Westmeath, Ireland. A. VII. ? I. 
*** Stem coated with 3 times as matry tubes as there are branch- 
lets in each xohorl, two rows of secmidary bctioeen each pair of 
primary tubes cm which latter alone the spines' or tubercles are 
placed. 
15. C. as'pera (W.) ; dioecious, st. finely striate smooth flexible 
with setaceous patent spines, branchleta short, bracts whorled 
slender (2 inner longer), nucules narroivly oblong shorter than 
the bracts. — E. B. S. 2738. — Not opaque, pale green. St. densely 
crowded ; spines scattered, often veiy short, or iiTegularly 
whorled. Eranchlets 6 — 9 in a whorl, of 7 joints, 4 — 5 bracts 
at each joining. Nucules solitary, striae 12 or 13, crown pro- 
minent. — Stagnant water. A. VIII. E. I. 
16. C. frag' His (Desv.); monoecious, st. slender finely striate 
smooth not spinalis, last 1 — joints of branchlets withoift external 
tubes, bracts on the inner side of the branchlets about as long as 
or longer than the oblong nucules. — Atl. Fl. Par. 88 C. C. Hed- 
wigii E. B. S. 2762. C. pulchella E. B. S. 2824.— Slender, green 
and remaining so through the winter, not incrusted ; external 
tubes nearly straight. Nucule with 13 or 14 striiE and a long 
crown, with the globule. Bracts usually shorter than the nu- 
cules, one equalling them ; or all longer. — Stagnant water. A. 
VI. --VIII. E. S. I. 
