Fig. 354. SCHIZOSIPHON WAREENIZE. 
Colour. Dark green. 
Substance. Soft ; fleshy ; slimy. 
Character of Frond. Roundish, irregularly-spreading lumps, running together, and forming a 
glazy crust upon rocks ; formed of closely-packed threads {filaments) radiating from 
a centre. 
Internal Filaments. Tubular ; containing cylindrical colour-cells, which show through ; set 
in wide transparent sheaths, composed of innumerable upright, hair-like, gelatinous 
shreds ; so closely set as to look entire, all but the tips. A nearly globose cell at the 
bottom of each (a microscopic object). 
Measurement. The patches spreading indefinitely. 
Fructification. Minute seeds {zoospores) formed of the coloured cells in the filaments ; which 
cells then separate from each other and drop out. 
Habitat. Coast of Devonshire. On rocks at high-water mark ; chiefly in places exposed to 
the drip of fresh water. 
Fig. 355. SCHIZOTHEIX CEESWELLII. 
Colour. The tuft greenish-olive ; the threads which compose it, yellowish-green. 
Substance. The tufts soft ; spongy ; the threads which compose it, rigid. 
Character of Frond. Dense, cushion-like tufts, spreading on the surface of rocks in round or 
oval patches ; composed of very slender threads {filaments) collected into branching 
bundles. Filaments curved, interlaced, branched in a forked manner (a microscopic 
object). 
Measurement. The patches several inches across. 
Fructification. Not ascertained. 
Habitat. On sandstone rocks near high-water mark ; exposed to the drip of fresh water. 
Fig. 356. CALOTHRIX CONFERVICOLA. 
Colour. A fine, deep, metallic green ; reflecting prismatic colours under water. 
Substance. Rigid for so tiny a plant. 
Character of Frond. Minute, starry tufts of threads {filaments) only a few in each ; scattered 
over the fronds of other algse, and often covering them altogether. Filaments tubular ; 
containing very narrow, cylindrical colour-cells, which show through, with division- 
lines. 
Measurement. Never more than J inch high ; often less. 
Fructification. As in Schizosiphon and Rivularia. 
Habitat. Our coasts generally. On small algae between tide-marks. Abundant in the 
autumn. 
This charming little parasite, instead of disfiguring the plant on which it grows, often 
makes it a good deal handsomer than it was before. For instance, it is specially fond of the 
pale, sickly-looking Ceramium rubrum, which grows in high-water pools, and this it adorns 
with a fringe of dai’k green. Some unusual appearances are figured' in the outer magnified 
form on the Plate. They are not understood. 
150 
