. Texte-livre de botanique, morphologiques et physiologiques. La botanique. 4i8 des cryptogames. au niveau inférieur entre eux ou par l'intermédiaire de l'archaios d'une feuille. Ils ne sont pas aussi nombreux que ceux de la plupart des fougères, et ils diffèrent d'eux dans leur lumière, leur couleur plus structure délicate et leur plus grande épaisseur, particularités qu'ils partagent avec ceux d'Ophioglosseae. Il ramify considérablement dans le sol, apparemment dans une manière monopodiales. Les feuilles qui, dans les espèces plus petites atteindre une hauteur de un à deux pieds, dans le plus grand {Angiopteris) de cinq à dix pieds, ont un long pet ferme

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. Text-book of botany, morphological and physiological. Botany. 4i8 VASCULAR CRYPTOGAMS. lower level between them or through the cicatrix of a leaf. They are not so numerous as those of most true Ferns, and they differ from them in their light colour, their more delicate structure and their greater thickness, peculiarities which they share with those of Ophioglosseae. They ramify considerably in the soil, apparently in a monopodial manner. The leaves which in the smaller species attain a height of from one to two feet, in the largest {Angiopteris) of from five to ten feet, have a long firm petiole, channelled on its inner surface, which bears the compound lamina which is either pinnate or bi-pinnate, or palmate as in Kaulfussia. The primary petiole is attached to the basal portion by means of an articular swelling, and the secondary petioles are connected with it, the leaflets with their rachis, in the same manner, just as is the case in the Leguminosse. The Marattiacese differ from the glabrous Ophioglossese in that they are hirsute, but not nearly so much so as the true Ferns.. FIG. 292.—^? under surface of the upper part of a leaflet of Angiopteris caudata, with sori s s. B some teeth of the margin of the leaf of Marattia sp. with sori s s. C half a sorus with opened sporangia (chambers). The Sporangia of the Marattiacese are developed in considerable number on the underside of ordinary leaves which have undergone no further modification. Like those of the majority of true Ferns they are borne upon the veins of the leaves, and are usually arranged in two rows forming sori, which either cover the veins running from the midrib to the margin of the leaflet throughout their whole length (Dancea), or only for a short distance near the margin {Angiopteris, Marattia) ; in Kaulfussia they are placed upon the delicate anastomosing branches of the veins. The sorus is borne upon a cushion-like outgrowth of the tissue of the vein, the placenta. In Angiopteris alone are the

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• bookcentury1800
• bookdecade1880
• booksubjectbotany
• bookyear1882