Plate LI. 



Pig. 230. MICROCLADIA GLANDULOSA. 



Colour. A fine rose-red. 



Substance. Membranaceous, though firm. 



Character of Frond. Thread-like {filamentous), though compressed; of nearly the 

 same width throughout; tutted; much branched from the base, in an alter- 

 nate or irregularly forked manner; forming a roundish outline. Angles of 

 branching (axils) wide-spread; last branchlets short; tips either awl-shaped 

 or split, in which case they resemble pincers. 



Measurement. One or 2 inches long. 



Fructification. Of two kinds. 1. Masses of spores in roundish capsules; surrounded 

 by two or three short branchletee^^s (ramelli); sessile on the margin of the 

 branches. 2. Tetraspores imbedded in the tips of the same. 



Sahitat. South and east coasts of England and Ireland. Hompton (N, of Hull). 

 Bray. Kingstown. Scilly. 



Fig. 231. CERAMIUM DECUREENS. 



Colour. A dull purplish-pink. 

 Substance. Soft. 



Character of Frond. Tufts of jointed threads {filaments) ; much branched. Fila- 

 ments thicker than hog's bristles below, gradually finer upwards; distinctly 

 forked; naked, or furnished with a few scattered branchlets; the tips 

 hooked inwards. 



Joints. Partially coloured; a narrow transparent space in the centre of each (see 



figure), the coloured portion melting gradually into the white. 

 Measurement. From 6 to 8 inches long. 

 Fructification. Not observed. 



Habitat. Our coasts generally. On rocks and the smaller algse in tide-pools. 

 Eare. 



Pig. 232. CERAMIUM GRACILLIMUM. 



Colour. A dark reddish-purple. 

 Substance. Very soft, tender, gelatinous. 



Character of Frond. Tufts of jointed threads (^filaments) ; much branched. Fila- 

 ments excessively slender, more so than a human hair; of nearly the same 

 thickness throughout; regularly forked, or nearly so; the branches set 

 with minute many-times-divided branchlets, spreading fan-wise; the tips 

 slightly hooked. 



Joints. Colourless. Partition-lines {dissepiments), opaque, purple. 

 Measurement. From 2 to 3 inches long. 



Fructification. Only one kind observed. Minute spores in large roundish capsules, 

 sessile on the branchlets, often two together. With several slender branchlet- 

 eens, ray-like, spreading below them ; their tips forked. 



ICahitat. South of England and west of Ireland. On Corallina officinalis, &c. 

 between tide-marks. Not common. 



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