442 
THE SEAWEEDS 
Ternate. — Arranged in threes. 
Tessellated. — -Formed of little squares, checkered. 
Tetrasporangium. — The organ in which tetraspores are formed. 
Tetraspore. — A non-sexual spore, one of a group of four, characteristic of the red sea- 
weeds. 
Thallus. — The vegetative body, undifferentiated into stem and leaves, of most seaweeds. 
Thyrsoid. — A dense panicle. 
Tomentose. — Densely pubescent with matted wool, or short hairs. 
Torulose. — CylindrLc, with swollen portions at intervals, somewhat moniliform. 
Trichoblasts. — Bunches of hair-like processes characteristic of certain Rhodophyceae. 
Trichogyne — The elongate receptive cell, attached to the carpogonium, and through 
which the spermatia enter the carpogonium. 
Trichothallic.^ When the shoot ends in one or more multicellular hairs or a tuft of 
such; growth occurring at the base of the hairs. 
Trichotomous. — Branching in a three-forked manner. 
Tricuspid. — Tipped with three points. 
Tubercle. — A small excrescence on a plant. 
Tufa. — Soft porous stone, etc., formed by deposition from water, usually calcareous. 
Uliginous. — Growing in swamps; slimy, muddy. 
Umbilioate. — Having a projection. 
Unilateral. — One-sided, either originating or, usually, all turned to one side. 
Unilocular. — One-celled. 
Uniseriate. — In one row or series. 
Urceolate. — Pitcher-like, hollow and contracted at the mouth, swelling below. 
V elate. — Veiled. 
Ventral. — The lower side of a^creeping plant, in contrast to the upper or dorsal. 
Ventricose. — Swollen or inflated on one side. 
Verrucose. — Covered with wart Tike protuberances. 
V erticillate. — Whorled. 
Vesicle. — A small bladder or cavity. 
Vesiculose. — As if composed of little bladders. r. ■ 
Virgate. — W r and-shaped, twiggy. 
Whorled. — The arrangement of organs in a circle round an axis. t . — 
Zonate. — 'Marked into circular zones. 
Zoospore. — A motile, asexual, reproductive spore with cilia. 
Zygote. — A body produced by fertilization or conjugation of two gametes. 
