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Plcell.aph. 1. HyDROPHYT^. 11. Codium. 295
;
2. Codium dichotomum. Two-forked codium,
Mass nearly cylindrical, threadlike, forked.
Spon^ia dichotomos teretifolia, viridis, Raii Syn. 29, 3.
Spongia dichotomos compressa ex viride splendens, Raii S^n. 29, 4.
Fuciis toraentosiis, Hudson Fl. Jngl. 584 ; Engl. Bot. 717.
Fucus fungosus, Des Font. Fl. All. 2, 428.
Spongidium dichotomum, Lamouroux Essai.
Codium tomentosum, Stackh. in Agardh Disp.
South-west coast ; perennial ; June and July.
Trunks from a dilated base, many, 6 inches long ; fork
obtuse-angled; Iranches even-topped, blunt at the tip.
&. marginifer. Mass two-forked, beset all over with
short, horizontal, forked segments.
E. DiATOMiDEJE. Tliallus threadlike, tubular, flat,
jointed, sometimes united parallelly through their whole
length ; joints often separating but still cohering at the
angles; spordia granular, enclosed in the joints—often parasitic
on marine plants, forming when dry a shining white
crystalline crust.
XII. 12. FRAGILARIA. Lyngbye. Breaking-up,
Thallus threadlike, jointed, flat, not branched, very
brittle; joints without any band, separating but cohering
by one of their corners ; sporidia granular, enclosed in the
Joints.
1. Fragilaria striatula. Streaked Ireaking-up.
Threads yellowish green, compressed, even ; joints shorter
than broad, in pairs, regularly streaked tr^nversely.
Conferva striatula, Engl. Bot. 192S.
Fragilaria striatula, Lyngbye Hydr Dan. 183.
On rocks and marine plants ;
April.
Threads about a tenth of an inch lonsr.
e'
2. Fragilaria icEniccformis. Tapeworm Ireaking-up.
Threads compressed, pale green, even ; joints three times
broader than long, obscurely variegated.
Conferva taenisL'formis, Engl. Bot. 1883.
Diatoma ? tsnia^formis, Agardh Disp. 35.
On marine plants ; February.
Tufts a twelfth of an inch long.