Fig. 52. LIT,OSIPHON PUSILLUS. 
Colour. Olive-brown. 
Substance. Soft ; membranaceous ; slimy. 
Character of Frond. Long thread-like (^filiform') tufts ; unbranched ; of equal thickness 
throughout ; clothed with hairs ; growing in patches on old fronds of Chorda filwn. 
Measurement. From 2 to 6 inches long ; thickness, a hog’s bristle. 
Fructification. Minute seeds {spores')., solitary or in clusters ; scattered over the surface of the 
frond. 
Habitat. Our coasts generally. Always parasitic on Chorda filum. Common. 
This genus is now called, by Continental botanists, Wyattia, after Mrs. Wyatt. 
Fig. 53. LITOSIPHON LAMINARIJ^. 
Colour. Dull olive-brown ; marked with bands across. 
Substance. Soft ; membranaceous. 
Character of Frond. Short, thread-like {filiform), starry tufts ; unbranched ; smooth (or hairy 
at the tips) ; blunt upwards ; scattered dot-like on the frond of Alaria esculenta. 
Measurement. From J to J an inch long ; thickness, a hog’s bristle. 
Fructification. Minute seeds {spores) solitary, scattered ; or several in each band across. 
Habitat. Our coasts generally. Always parasitic on Alaria escidenta. Common. 
Now Wyattia laminaria. 
Fig. 54. LEATHESIA TUBERIFORMIS. 
Colour. Olive-brown. 
Substance. Fleshy ; elastic ; slippery-feeling. 
Character of Frond. More or less globose ; forming tubers of various sizes and shapes ; full 
of cottony fibres when young ; hollow and inflated when older ; adhering to rocks in 
large patches, or growing on the fronds of other alg^. 
Measurement. Every size, from a pea to a large walnut. 
Fructification. Minute seeds {spores) concealed in the substance of the frond. 
Habitat. All round our coasts. On rocks and algse between tide-marks ; abundantly. 
Called tuheriformis, or tuber-shaped, from its resemblance “to a cluster of small potatoes.” 
For another Leathesia see Plate XV. 
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