Fig. 68. MYRIONEMA STRANGULANS. 
Colour, Dark-brown. 
Character of Frond. Minute ; parasitic ; forming a small, convex, dark -brown, dot-like patcli 
on a flat frond ; a ring -like collar round a filiform one. Filaments jointed. 
Measurement. A dot or an encircling patch, varying in extent. Filaments excessively short. 
Fructification. Minute seeds {spores') nestling among the threads {filaments) of the frond. 
Habitat. Our coasts generally. On Ulvoe and Enter omorphce. 
The dark-hrown specks and bands formed by this plant on the green fronds of TJlvcp, &c. 
may easily be mistaken for symptoms of decay, if not carefully examined. They consist of 
numerous short, upright, jointed threads, springing from a thin expansion composed of 
decumbent ones. But it requires a microscope and skill to find all this out. The general 
appearance is soon learnt. 
Fig. 69. MYRIONEMA LECLANCHERII. 
Colour, Olive. 
Character of Frond. Minute ; parasitic ; forming round, flat, olive-coloured patches on the 
fronds of Rhodymenia palmata and Ulva latissvna, making them look as if spotted 
with decay. Filaments jointed. 
Measurement. The patches sometimes extend to J of an inch of diameter. Filaments ex- 
cessively short. 
Fructification. Minute seeds {spores') nestling among the threads {filaments) of the frond. 
Habitat. Our shores generally. On Uhodymenia palmata; and on Ulva latissima, in deep 
water. 
Thinner and lighter coloured than M. strangulans, and spreading in much larger patches. 
Fig. 70. MYRIONEMA PUNCTIFORME. 
Colour, Dark-olive. 
Character of Frond. Minute ; parasitic ; convex ; forming globose dots on Ceramium rubrum^ &c. 
Measurement. A dot ! 
Fructification. Minute seeds {spores) among the threads {filaments) of the frond. 
Habitat. Our coasts generally. On several red sea-weeds. 
Easily mistaken for little bits of dirt, unless examined. For another Myrionema^ see 
Plate XVIII. Fig. 75. 
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