I : SUPPLEMENT .
Z ygnema in s ig n e Hass.
Plate C H I. Figs. 1, 2.
Char. Filaments o f considerable size. Cells fo u r or fiv e
times as long as hroad, inverted. Spires three, lax, indistinct,
Sporangia oval, acute, producing considerable
inflation o f the cells in which theg are placed.
Hab. Ponds at “VVadlmrst, near Tunbridge Wells, and
Iden, near Rye : Mr. Jenner.
This fine species is rendered particularly interesting from
the circumstance of its being the only Zygnema with three
spires having inverted cells, all other species thus constructed
which have hitherto been discovered possessing, with but one
exception, in which there are two threads, only a single
spire.
The filaments are about equal in size to those of Zygnema
rivulare, from which it is at once distinguished by its inverted
cells.
The credit of the discovery of this species is entirely due to
Mr. Jenner.
L yngbya pu sco-pu r pu r e a Hass.
Plate V I I I . Figs. 1, 2.
Char. Filaments o f considerable size, forming a hroivnish
green or purple stratum, glossy. Endochrome at fir s t
homogeneous, subsequently granular. Granules/eia, about
jiv e in each cell.
Grev. Alg. Brit. p. 177. ; Hook. Br. Fl. vol. ii. p. 316. ;
“Wyatt, Alg. Danm. No. 167. Conf. fusco-purpurea
Dillw. t. 92. ; E. Bot. t. 255. Conf. atro-purpurea
Dillw. t. 103. ; E. Bot. t. 2085. Bangia atro-purpurea
Harv. p. 172.
Hab. Grand Canal, near Dublin : W. H. Harvey.
Between this production and Lynghya zonata there is a
great structural resemblance, and assuredly the two species
do not difier generically from each other.
The interesting discovery of this being a freshwater production
was made by Mr. Harvey, who states tha t the locality
in which he gathered it had no communication with the sea.
C occochloris c y s t if e r a Hass.
Plate C H I. Fig. 3.
Char. Granules rather large, mostly oval, contained in mucous
cysts, each cyst being occupied with either one or two, but
sometimes, fo u r granules.
Hab. Near Bristol : Mr. Thwaites.
This and the two following species are particularly interesting,
from the fact of their exhibiting a cysted structure,
whereby a close relation is manifested in these species to
Hæmatococcus, and which structure moreover it is probable
does in reality belong to all the species of the genus Coccochloris,
but which escapes detection from the exceeding delicacy of
the organisation of many of the species.
C occochloris v a r ia b il is Hass.
Plate C H I. Fig. 4.
Char. Granules in the dried condition not having any regular
form, rather small. Cysts somewhat large, containing
one, two, or fo u r granules, mostly spherical.
Hab. On thatch, Northiam : Mr. Jenner.