. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 86 CELLULAR TISSUE. guard-cells, is free from wax-covering, the stoma is as it were shut oflf from this by the ring. Other species of Strelitzia have a similar ring, though in form and distribution of rods they differ from S. ovata. The structure and development of the wax coverings and intramural wax have been described by the author of this book in a longer treatise (Bot. Ztg. 1871). There also the very limited older literature on this point is quoted. Later Wiesner made two additions (Bot. Zt
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 86 CELLULAR TISSUE. guard-cells, is free from wax-covering, the stoma is as it were shut oflf from this by the ring. Other species of Strelitzia have a similar ring, though in form and distribution of rods they differ from S. ovata. The structure and development of the wax coverings and intramural wax have been described by the author of this book in a longer treatise (Bot. Ztg. 1871). There also the very limited older literature on this point is quoted. Later Wiesner made two additions (Bot. Ztg. 1871, p. 769). For various details we must refer to these special works. We can here add but little to what has been said above. The internal structure of the wax coverings, which in the rods is indicated by the striation, by the presence of longitudinal layers of alternately unequal optical properties, attains in the thick layers a complicated differentiation. In the investigated material of Klopstockia cerifera Karst. (Fig. 30) the covering attained a thickness of mm. Above each stoma it is perforated by a perpendicular canal S-S' which contains air and fungal hyphae. It is composed of pris- matic pieces, of which each fits exactly over one epidermal cell, and which are not arranged sepa- rately side by side, but are connected directly by a homogeneous intercalary or fundamental mass. This appears in thin sections as a trans- parent limiting band between the sides of the prisms. Each of the latter shows internally (i) a rich and delicate stratification parallel to the outer surface of the contiguous epidermal cell, dark and clear layers alternating, of which the latter resemble the hyaline limiting bands; (2) darker longitudinal bands perpendicular to the strata and to the surface, these are denser the nearer they run to the lateral surfaces of the prism in the hyaline substance; (3) delicate striations which run from the lateral faces obliquely at an angle of 3o
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
