. The elements of materia medica and therapeutics (Volume 2) . 1. $\\z Vegetable I. Cryptogamia, Linnceus.—FEowerless Plants. Acotlledones, Jussicu.—, De Candollc.—Acrogens, Lindley. Essential Characters.—Substance of the plant usually composed of cellular tissue chiefly,cither in a spheroidal or elongated state; spiral vessels or ducts only present in the highestorders. Stem cither increasing by an extension of its point, or by a regular or irregular de-vclopcment in all directions from one common point; not increasing perceptibly in thickness ordensity when o
. The elements of materia medica and therapeutics (Volume 2) . 1. $\\z Vegetable I. Cryptogamia, Linnceus.—FEowerless Plants. Acotlledones, Jussicu.—, De Candollc.—Acrogens, Lindley. Essential Characters.—Substance of the plant usually composed of cellular tissue chiefly,cither in a spheroidal or elongated state; spiral vessels or ducts only present in the highestorders. Stem cither increasing by an extension of its point, or by a regular or irregular de-vclopcment in all directions from one common point; not increasing perceptibly in thickness ordensity when once formed. Cuticle generally destitute of stomala. Sexual organs, nnd conse-quently flowers, absent. Reproduction taking place either by spores or sporules [sporaz seuspontics], which are enclosed in cases called thecal [sporangia], or embedded in the substanceof the plants ; or else by a mere dissolution of the utricles of cellular tissue ; germination oc-curring at no fixed point, but upon any part of the surface of the spores {Lindley). Fig. Structure of Cryptogamic Plants. a. Longitudinal section of a ). Transverse section of a stem,c Stem of a moss with leaves and theca, or Leaf of a moss magnified. c. Leafy thallus of a lichen with apothecia. /. Crustaceous thallus of a lichen with apothecia. g. Fungi of the highest tribe. h, i. Fungi of the lowest rank. k. Conferva magnified. Order I.—ALG^E, Juss.—THE SEA-WEED TRIBE. Algaceje, Lindley. Essential Character.—Leafless, flowerlcss plants, with no distinct axis of vegetation, grow-ing [with very few exceptions] in water, frequently having an animal motion, and consist-ing of simple vesicles lying in mucus, or of articulated filaments, or of lobed fronds, formed ig oi simpleVOL. II. 42 ELEMENTS OF MATERIA MEDICA. of uniform cellular tissue. Reproductive matter either altogether wanting, or contained injoints of the filaments, or deposited in thecce of various forms, size, and position, c
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