. British ferns and their varieties. Ferns. THE LASTREAS 141. HYMENOPHYLLUM UNILATERALE (The One-sided Filmy Fern) (Plate XXXIX) Somewhat more common than H. Tun- hridgense, and occupying precisely similar habitats. The only differences, indeed, are indicated in the name, as regards form of frond (Fig. 145), and in the shape of the spore receptacles, which in this species consist also of two valves, but differ in shape, as shown in Fig. 145 ; otherwise our previous remarks apply exactly. THE LASTREAS (NEPHRODIUMS) (The Buckler Ferns) The Lastreas are also named Nephrodiiims, and the latter nam
. British ferns and their varieties. Ferns. THE LASTREAS 141. HYMENOPHYLLUM UNILATERALE (The One-sided Filmy Fern) (Plate XXXIX) Somewhat more common than H. Tun- hridgense, and occupying precisely similar habitats. The only differences, indeed, are indicated in the name, as regards form of frond (Fig. 145), and in the shape of the spore receptacles, which in this species consist also of two valves, but differ in shape, as shown in Fig. 145 ; otherwise our previous remarks apply exactly. THE LASTREAS (NEPHRODIUMS) (The Buckler Ferns) The Lastreas are also named Nephrodiiims, and the latter name being descriptive of the kidney-shaped spore cover of the genus, we think it well to mention it, since as a distinctive name it is better than a merely personal one. The latter, however, Lastrea, named after a French botanist, is too familiar to dislodge from the British Fernist's vocabulary, and we are the very last to attempt to do so and thus contribute to the confusion already caused in that connection by would-be reformers. As we have said, it is the kidney-shaped indusium, or spore cover, which distinguishes this genus, and this is indicated in the popular name of Buckler Ferns, as distinct from the Shield Ferns, in which the cover is perfectly round. This, however, is by no means the only difference, since the Shield Ferns are of very different make, and are all easily recognizable by the peculiar mitten-shaped pinnae, or pinnules, as well as by their texture. There is considerable difference of opinion as to the number of our native species of this genus, owing to the fact that several of them run each other so close, and present so many linking or intermediate forms, as to render the drawing of a hard and fast line an impossibility. Several species, however, are beyond cavil, viz. L. montana {oreopteris), the Lemon-scented Fern, L. thelypteris, the Marsh Fern, L. dilatata, the Broad Buckler Fern, L. rigida, the Limestone Buckler Fern, and L. cBmula, the Hay-scented F
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectferns, bookyear1912
