Ser. CHLOROSPERME®. Fam. Ulvacee. 
Puate CCLXIII. 
ENTEROMORPHA HOPKIRKII, J Cala. 
Gen. Cuar. Frond tubular, membranaceous, of a green colour, and reti- 
culated structure. ructification ; granules, commonly in fours, 
contained in the cellules of the frond. ENnreromorpHa (Linn.),— 
from evrepoy, an entrail, and popdn, form or appearance. 
EnteromorpHa Hophirkii ; frond excessively slender and byssoid, flaccid, 
very much branched ; branches feathery, decompound, erect, attenu- 
ated, set with minute, subulate ramuli; cellules large, hyaline, each 
cell containing one or two minute grains of endochrome; the ramuli 
composed of a single series of such cellules. 
EnteromorPHa Hopkirkii, M‘Calla, Alg. Hib. ined. Harv. in Phyc. Brit. 
vol. i. pl. XV. Harv. Man. ed. 2. p. 
Has. Dredged in 4—10 fathoms water. Annual. Summer and cotinine 
Goodrmgton, Torbay, Mrs. Griffiths (1838). Carrickfergus, Mr. 
M‘Calla (1845). 
Geoer. Distr. ? 
Descr. Fronds six to twelve inches long or more, of exceedingly fineness and 
delicacy, the main stems being scarcely the diameter of human hair, the 
branches and ramuli very much more slender; excessively branched and 
feathery, the branches erect, straight, alternate, or rarely opposite, tapering 
to a fine point, repeatedly decompound, the ultimate divisions set with 
minute, awl-shaped ramuli. The structure of the frond is peculiarly lax. 
The cells in the branches are of large size, about three or four visible in the 
breadth of the branch, hyaline, containing generally a single small grain of 
grass-green endochrome or chlorophyll. The ultimate ramuli consist of a 
single series or string of such cells, or, in other words, are articulated. 
There is much less difference between the diameter of the larger and 
smaller branches in this species than in most others of the genus. Colour 
a pale yellowish green, becoming paler in drying. Substance exceedingly 
flaccid and tender, most closely adhering to paper in drying. 
enn 
I am not prepared to defend the characters of all the species of 
the genus Hnteromorpha; but among our British kinds the present 
one is remarkable for having some points easily recognisable, 
and for being a plant of much delicacy and beauty. It rivals in 
the tenuity of its fronds, and in their bushy branching, the most 
delicate of the Cladophora, having, to the naked eye, an aspect 
not very unlike that of C. Rudolphiana, and being more slender 
than C. gracilis. Under the microscope it is known by the very 
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