Ser. CHLOROSPERMEA. Fam. Confervee. 
Puate CCCXXVIII. 
CONFERVA YOUNGANA, Dit. 
Grn. Cuan. Fidaments green, attached or floating, unbranched, composed 
of a single series of cells or articulations. F/wit, aggregated gra- 
nules or zoospores, contained in the articulations, and having, at 
some period, a proper ciliary motion. Conrerva (Pin.),—from 
conferruminare, to consolidate; because some of the species were 
used by the ancients for binding up fractured limbs. 
Conrerva Youngana ; filaments short, tufted, straight or nearly so, some- 
what rigid; articulations once or twice as long as broad, dissepi- 
ments finally contracted. 
Conrerva Youngana, Dillw. Conf. t.102. Harv. in Hook. Br. Fl. vol. ii. 
p. 354. Harv. Man. ed. 1. p.131. ed. 2. p. 210. dg. Syst. p. 101. 
ConFERVA isogona, #. Bot. t. 1930. 
Hormorricuum Younganum, Kiitz. Sp. Alg. p. 382. 
HorMortriIcuuM isogonum, Kiitz. Sp. Alg. p. 382. 
Has. On rocks and stones near high water-mark, on various parts of the 
coast. Annual. Summer. Discovered by W. Weston Young, Fsq., 
near Dunraven Castle, Glamorganshire. Yarmouth, Sir W.J. Hooker. 
Dingle Bay, Kerry, Mr. D. Moore. 
Groar. Distr. Shores of Northern Europe. 
Descr. Filaments from half an inch to an inch in length, erect, straight or 
slightly curved, obtuse, tufted, or spreading in wide shaggy fleeces over 
the surface of a rock. When young, the filaments are cylindrical, but 
they soon become contracted at the dissepiments. The cells are occa- 
sionally only as long as broad, but are usually once and half as long. The 
endochrome is granular and dense, filling the cell, and of a full green colour, 
As it becomes mature it acquires still greater density and a darker colour, 
and shrinks to half its size. Finally, it is changed into a bipartite spori- 
dium lodged in a swollen and colourless cell. Sudstance membranaceous, 
not very soft, and having little gloss. In drying, the plant adheres, but 
not very closely, to paper. 
PAPA PPP PL APP 
To the naked eye this plant has very much the aspect of 
Lyngbya Carmichael, with which (as I have already stated 
under Plate CCC.) it is properly a congener; but it is readily 
distinguished under the microscope, by the much longer cells, 
