i 
every lacinia is drawn out at the apex into tendrils, and the depauperated 
lamina very much cut into narrow, jagged processes. Tudercles . solitary, 
either seated on the nerves of the leaf, or borne on little leaflets rising from 
the nerve, depressed, containing a tuft of beaded filaments, finally resolved 
into spores. Zetraspores in oblong or linear marginal sori, formed at the 
apices of the lateral nerves, often confined to the slender, marginal processes. 
Coloux, a beautiful purplish crimson or lake. In drying, the frond adheres 
to paper. 
Next to D. sanguinea (Tab. CLI.) this, when well grown, and 
of large size, is one of the handsomest of the genus. Our plate 
represents the frond in rather a young state, a specimen having 
been chosen for figuring which exhibits the changes that take 
place in form during the growth of the frond. At first the plant 
consists of a simple, penninerved leaf sinuated at the margins. 
The sinuosities gradually deepen into lateral lobes; and these 
lobes, as is shown in the lower part of the figure, deepen into 
branches, or new fronds, at first smuous, then lobed and at length 
divided like the fronds from which they grow. Thus, eventually, a 
much branched and leafy frond results from the original leaf, by 
regular growth and subdivision of the margin. When any vigo- 
rous part is wounded, an irregular, proliferous growth likewise 
takes place, new leaflets springing from any part of the midrib. 
Sometimes the margin is much laciniated. 
D. sinuosa is abundant throughout the Northern Atlantic. In 
the Southern Ocean it is represented by D. quercifolia and D. 
Tyallii, two very beautiful species which resemble it closely in 
form and mode of growth, but which are essentially different. 
Fig. 1. A young and vigorous frond of DELEssERIA sINvOsA. 2. Leaf from an old 
frond, of the cut variety, with sori of tetraspores in the marginal lobes :— 
both of the natural size. 3. Marginal lobe with tubercle. 4. Section of 
the tubercle. 5. Strings of spores, from the same. 6. Marginal lobe, 
with sorus, formed out of the apex of the nerve. 7. Tetraspore. 8. Por- 
tion of the surface :—al/ magnified. 
