424 SYSTEMATIC BOTANY, OR 



is adopted in his Genera Plantarum, published between the years 

 1836 — 1840. The followino: is a sketch of this system. He 

 divides plants into two great divisions, which he has denominated 

 Eegions, and named Thallophyta and Cormophyta. These 

 were again divided into Sections and Cohorts, as follows : — 



Region 1. Thallophyta. Plants with no opposition of stem and 

 root; with no vessels and no sexual organs; and 

 with germinating spores lengthening in all direc- 

 tions. 

 Section 1. Pro^ophyta. Plants developed without soil ; draw- 

 ing nourishment from the element in which they 

 grow ; and having a vague fructification ; as in 

 Algse and Lichenes. 

 Section 2. Hyaterophyta. Plants formed on languid or de- 

 caying organisms; nourished from a matrix ; all 

 the organs developing at once, and perishing in 

 a definite manner ; as in Fungi. 

 Region 2. Cormophyta. Plants with stem and root in opposite 

 directions ; spiral vessels and sexual organs dis- 

 tinct in the more perfect. 

 Section 3. Acrnhrya. Stem growing at the point only, the 

 lower part being unchanged, and only used for 

 conveying fluids. 

 Cohort 1. Anophyta. Having no spiral vessels; both sexes 

 perfect; spores free in spore-cases. Examples, 

 Hepaticae and Musci. 

 Cohort 2. Proiophyta. Having vascular bundles more or 

 less perfect ; male sex absent ; spores free in 

 one or many-celled spore- cases. Examples, 

 Filices and Equisetaceoe. 

 Cohorts. Hysterophyta. Having perfect sexual organs; 

 seeds without an embryo, polysporous; para- 

 sitic. Example, Rhizanthese. 

 Section 4. Awphibrya. Stem growing at the circumference. 

 Examples, Gramincaj, Lihaccaj, Iridaceai, Orchi- 

 daceas, and Palmacea. 

 Section 5. Acramphibrya. Stem growing at both the apex 

 and circumference. 

 Cohort 1. Gymnosperma. Ovules naked, receiving impreg- 

 nation immediately by the micropyle ; as in 

 Con i ferae. 

 Cohort 2. ApetalcE. Calyx absent, rudimentary or simple, 

 calycine or coloured, free or united to the 

 ovary. Examples, Cupuliferae, Urticaccaj, and 

 Polygoneai. 

 Cohort 3. Ganwpetalcr. Both floral envelopes present, the 

 outer calycine, the inner corolline, the latter 



