424 Notes on the Blue-green Algae, etc. 
moving water; on moist ground, etc. (G., 
213, 6, 14; T., 67, 4, 7.) 
72. Stratum black .. : ar O. margaritifera 
Trichomes curved, constricted at joints ; 
cells 17-29 mic. in diameter, 3-6 mic. long, 
transverse walls granular; apex slightly 
tapering, capitate, calyptra slightly con- 
vex. Marne a(Ce 216.6, cok Ie ogra, 
LE) 
72. Stratum dull red .. QO. miniata 
Trichomes constricted ‘at joints (23 
cells 16-24 mic. in diameter, 7-11 mic. 
Jong; apex | briefly tapering, obtuse, 
capitate, calyptra convex. Marine. (G., 
2TOP ame OSE 
73.. Stratum dark blue-green. (See No.-71.) .. He O. limosa 
73. Trichomes solitary ; colour inconspicuous .. ©. decolorata 
Solitary trichomes among other species 
of Oscillatoria, 12-13 mic. in diameter,.not: : 
attenuate, not capitate, not constricted at i See 
joints ; cell contents reticulate with minute 
granules; ‘cells a little shorter than the 
diameter ; apical cell hemispherical. — In 
fresh water, Barwell Load, Cambridge, 
associated’ with O. proboscidea and O- 
splendida (G. S. West). (See De Toni, 
page 153:) .s- Soe 
GLOSSARY: 
Agglu’tinated (Lat. ae I glue), sticking together as if glued. 
Amorph‘ous (Gr. morphe; form, -a, without), .shapeless, not regular in 
form. 
Atten’uate (Lat. attenwatus, thinned), narrowed, tapering. 
Calyp’tra (Gr. kalwptva, a veil), a cap, or thickening of the cell membrane, 
frequently found at-the apex of a trichome. 
Cap‘itate (Lat. capitatus, having. ahead), applied to. trichomes with a 
more or less well-marked constriction at the apex and forming a 
globose or hemispherical, sometines conical, head. 
Chro’matin (Gr. chroma, colour), a substance. contained in the nucleus 
which readily takes up certain aniline and other dyes, and becomes 
deeply stained. It is characterized by containing phosphorus in 
organic combination and is probably very largely concerned both in 
reproductive and in vegetative activities. 
Chromat’ophore (Gr. chroma, colour, phoveo, I carry), plastids carrying 
the colouring matters in a plant cell, e.g., the chlorophyll granules. 
Cir’cinnate or cir’cinate (Lat. ciyvczno, I make round), coiled or rolled up 
from one end. 
Cyanophy’cee (Gr. kuanos, cornflower, blue, phwkos, seaweed), the blue- 
green Alge. 
Cyanophy’ein (Gr. kuanos, cornflower, blue, phukos, seaweed), a term 
applied to granules which take a characteristically bright red colour 
in carmine, found chiefly on the transverse walls of the cells of the 
blue-green alge. They are probably some kind of reserve substance. 
Cy’toplasm (Gr. kutos, a hollow vessel, plasma, moulded), the semi-fiuid, 
viscid substance in which the nucleus is embedded contained in the 
cells of both animals and plants. It is a complex mixture of organic 
chemical compounds. 
Diffluent (Lat. diffluens, dissolving), in a state of solution or fluidity. 
: Naturalist, 
