S Salvinia, [12] Salviniaceæ, [12] Scaly Spleen wort, [29], [77] Schizœaceæ, [11] Scolopendrium rhizophyllum, [3] vulgare, [81] Sea Spleenwort, [130] Seed, [27] Selaginella grandis, [30] spinosa, [12], [30], [106] Selaginellaceæ, [12], [26] Selaginellas, [30] Life histories of, [29] Sex organs, [17] Shade Horsetail, [116] Sigillariaceæ, [12] Smooth Naked Horsetail, [118] Soft Prickly Shield Fern, [60] Sori, [7], [14] Spermatozoids, [17] Spleenworts, [10], [66] et seq. [Sporangia], [6], [14] Spore cases (see [Sporangia]) Spores, [5], [15] et seq. Stag’s Horn Moss, [101] Stipes, [5]

T Three-branched Polypody (see [Oak Fern]) Tree Ferns, [4], [11] Triangular Buckler Fern, [55] Trichomanes, [30] radicans, [8], [33] Tunbridge Filmy Fern, [35]

V Variegated Rough Horsetail, [119] Vascular Cryptogams, [1] et seq. Economic importance of, [31] Vegetative reproduction, [3]

W Walking Fern, [3] Wall Rue, [10], [70] Wardian cases, [130] Water Club Mosses, [7] Water Fern, [7], [110] Water Horsetail, [118] Wolf’s Claw, [101] Wood Horsetail, [117] Woods, Mr. Joseph, [61] Woodsia hyperborea, [61] ilvensis, [62] Woodsias, [10]

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Transcriber’s Notes