( Greck,|mweIted). Polypodivlcus. Mamm HAIR I"s:i~zN. A large genus of widely distributed ferns of tropical countries largely, with polished black or pur plish stems, mostly smooth foliage to which water will not adhere, and marginal sori attached underneath an inrolled portion of the segment, which thus forms is protecting in dusium. The requirements of cultivation are plenty of space, od drainage, and a compost of peat, loam and sand. f the one hundred or more species, five are na tives, of which A oedafum is the best known. L. M. UNDEBWOOD. The genus Adiantum furnishes us some of the most useful and popular species of commercial ferns. They are easy of cultivation. They need a slightly shaded position, moderately moist atmosphere, and a temp. of 60-65° F. The soil should be composed of rich loam and leaf-mold in equal parts, and should be kept moderately moist. Some of the most useful ones for general pur poses (givenunder their trade names) are: A.¢znmlum, grows about 12-15 in. high, and has very graceful dark green fronds; A. bollum, a dwarf, very compact species 6-8 in.; A. cunea(um,A.cmuaIum var. grandiceps, with long, heavily-crested, drooping fronds; A. cuneatum var. mriegnlum makes a neat specimen; A. convin num, gracefully drooping dark green fronds 15 in. long, with overlapping pinnaa; A. ronrimmm var. la fum, of upright growth, is 24 in. high; A. decorum is very useful, 12-15 ln., and has young fronds of a pleasing metallic tint; A. ercisum var. multilidum; A. formosmn; A. Fcrgulonii; A. fragranlissimum; A. pubesccns; A. tencmm and var. roseum; A. Wie gnndi; A.LeG1-andi, very dwarf; A. mamdulum, a very neat, dwarf species; A. rubellum, a dwarf spe cies with mature fronds light green, young fronds of a deep ruby tint. The above may easily be grown from spores, if sown on a compost consisting of half each of finely screened, clean soil and leaf-mold or post, and placed in a moderately moist and shady place in the greenhouse in a temp‘. of 60° F. To be grown most economically, they s ould be transplanted in clumps of 3 or 4 plants as soon as the first pinnaa have appeared, and, as soon as strong enough, potted off, either in clumps or singly. Some very desirable species to grow into large, tall specimens are: A. 1E!hi0p|'cum, A. Bunsen’, A. Collixii, A. Fergusoni, A. formosum, A. Lafhomii, A. Peru rianum, A. princeps, A. rhomboideum, A. Sande! Calharinm, A. Impeziforme, and A. Williamsii. The following are also recommended for special purposes: for fern-dishes, A. fulr.-mn; for cutting, A. gracillimum.