CRYPTOGAMIA. ALGAE. Conferva. 121 
C. equisetifoTia. Jointed, branched: branches awl-shaped, forked, 
in whirls. 
{Dillw. 54—1?. Bot. 1479. E.)— H. Ox. xv. 9. row 2. 7. 
Size of a packthread, three or four inches long; red. Stem branched. 
Branches generally alternate, taper, lower ones the longest; these and 
their subdivisions closely covered with whirls of short forked hairs, lying 
one over another. Stems, branches, and joints red, the other parts 
diaphanous. Lightf. 985. 
(Red Sponge Conferva. Griffithsia equisetifolia. Hook. E.) C. imhri - 
cata. Huds. On rocks, stones, and Fuci in the sea. At Penzance, and 
at Menabilly. Mr. Stackhouse. Dec. 
C. verticilla'ta. Threads branched, jointed: little branches in 
whirls, forked, bowed in. Lightf. 984. Huds. 653. 
(Dillw. 55— -E< Bot. 1718. E.) 
Stems many from the same root. Branches irregular, the whole covered 
with close whirls of fine, short, elastic, forked hairs, curved inwards. 
Lightf. Grows matted together. Substance tough and horny. Has 
the habit of Lycopodium clavatum. Mr. Stackhouse. (Four to six inches 
long. Fruit oblong, described as pedunculated capsules proceeding 
from the ramuli. 
•Whirled Spongy Conferva. Cladostephus verticillatus. Hook. E.) 
Among sea rocks in basons of water left by the tides. Lightfoot. At 
Polkerris, near Fowey, Cornwall. Mr. Stackhouse. 
Obs. The first four species in this subdivision may be readily distinguished 
by the following characteristics. 
C. intertexta. Has no mid-rib, is hardly an inch long, has the colour of a 
sponge and the texture of macerated wash-leather. It is much more 
entitled to the name spongiosa than the following’. 
C. spongiosa. This is two or three inches high, of a dark brown green, 
has a strong mid-rib tiled on every side with short, stiff, bristle-like 
threads, so that it much resembles the tail of a hound. 
C. equisetifolia. Has been named from its mode of growth resembling- 
some of the Equiseta. It is from three to five inches high, of a red 
clay colour. The jointed mid-rib is surrounded by whirls of short 
filaments, but these being longer than the joints it is entirely covered 
by them. 
C. verticil/ata. From three to six inches high, dark green, branches few, 
forked, mid-rib jointed, whirls of filaments not longer than the joints, 
and not so thick set as in the preceding, so that the mid-rib is suffi¬ 
ciently visible. In the older plants these filaments become white and 
opake. 
(C. alterna'ta. Variegated with brown and green; filaments un¬ 
branched, slender ; joints half as long again as broad, alternately 
pellucid and opake, here and there swelling. 
Dillw. Syn. 22. t. B— E. Bot. 2304. 
Filaments loosely entangled in light floating tufts, six or eight inches long, 
though often shorter. 
Alternate Conferva. C. vesicaia . Agard, Hook, Fresh water pools 
and ditches in spring, E, Bot- E.) 
