. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 282 PRIMARV ARRANGEMENT OF TISSUES. corners is smaller than that of the rows of leaves: in L. Selago, e. g. with whorls of five members (that is ten rows), there are 4-6, in L. inundatum with f arrangement of the leaves 4 or 5, in the above-mentioned branches of L. alpinum 3, &c. From Hegelmaier's statement that in the main vegetative axes of L. clavatum and L. annotinura, with a diver- gence of f, -^j, ^, there were found 10-17 corners, it would appear that there is a higher number of corne
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 282 PRIMARV ARRANGEMENT OF TISSUES. corners is smaller than that of the rows of leaves: in L. Selago, e. g. with whorls of five members (that is ten rows), there are 4-6, in L. inundatum with f arrangement of the leaves 4 or 5, in the above-mentioned branches of L. alpinum 3, &c. From Hegelmaier's statement that in the main vegetative axes of L. clavatum and L. annotinura, with a diver- gence of f, -^j, ^, there were found 10-17 corners, it would appear that there is a higher number of corners than of rows of leaves. Where the rows of leaves correspond exactly to the corners, all the bundles of one row of leaves insert themselves on the same corner. In other cases one corner may take up bundles from one row only, but must also often take them from more than one row. Usually it only takes up the bundles of two neighbouring rows, but sometimes also single bundles of more distant rows'. The bundles insert their inner end irregularly, some- times on the right, sometimes on the left, and sometimes on the inner side of the next lower bundle. Sect. 78. Selaginella. A number of species, forming no doubt the majority, such as S. Martensii, S. helvetica, pubescens, rupestris, &c., have in each shoot one axile, ribband- or plate-like vascular bundle, the faces of which in relation to the ground are directed upwards and downwards, while the margins are lateral to the right and left: in some, as S. pubescens, the bundle is provided at the middle line of its under surface, and near to each lateral margin with a sharp band-like process. The leaves have each one small bundle, and these behave in their course and insertion one on another, and also on the cauline por- tion, similarly to the leaf-bundles of Lycopodium. SThey are inserted on the bundle at its margins: in the species with two double rows of leaves, one facing towards each side, the bundles of the two corresponding
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