. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. ON VARIETIES IN PLANTS 313 But Piersoni soon produced a tri-pinnate sport which was more regularly divided. Its fronds were somewhat shorter and nuich broader at tlie base, thus making the plant more compact. It was named elcgantis- sima (Fig. 128, 3). Although it was unstable like Piersoni, its uniformity- was considerably improved by selection. Soon it prcxKiced a sport of quite similar characters except that it was more dwarf which was named compacta (Fig. 128, 4). In both elegantissima and comp
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. ON VARIETIES IN PLANTS 313 But Piersoni soon produced a tri-pinnate sport which was more regularly divided. Its fronds were somewhat shorter and nuich broader at tlie base, thus making the plant more compact. It was named elcgantis- sima (Fig. 128, 3). Although it was unstable like Piersoni, its uniformity- was considerably improved by selection. Soon it prcxKiced a sport of quite similar characters except that it was more dwarf which was named compacta (Fig. 128, 4). In both elegantissima and compacta there was variation from the tri-pinnate to the quadri-pinnate contlition. The Pierson fern also gave rise to another interesting series of new forms wliich exhibited variation in two more characters. In the ele-. FiG. 129.—The fronds of modern commercial varieties differ greatly from those of the original Boston fern. The varieties shown here are relatively stable, although they are all likely in turn to produce new sports some of which may prove valuable, a, viridissima; b, Millsii; c, muscosa; d, verona; e, magnifica; f, superhissima. (After Boshnakian.) gantissima series the color of the foliage is similar to that of the original Boston form, but in the new sport, which was named superbissima (Fig. 129/), the fronds are not only shorter and the pinna) three- or four- divided, but the foliage is of a deeper green color. Moreover, the fronds and separate pinnte are twisted so as to give the individual frond an irregular appearance although an entire plant appears fairly symmetrical. Although superhissima was unstable, producing uni-pinnate fronds occa- sionally, it soon produced a sport that is more compact in form and which proved to be more stable. This was named muscosa (Fig. 129,c). Other distinct uni-pinnate forms that have sprung as bud mutations either directly or indirectly from the Boston fern are the dwarfs, such as Scotti, Dwarf Boston, and Teddy Jr., and th
Size: 1882px × 1328px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksu, booksubjectplantbreeding
