. Il Fern alleati del Nord America nord del Messico. Pteridophyta; Botanica. Il QUILLWORT anfibio. 239 di Isoctcs Canadensis; ma è probabile che Isoctcs riparia non si verificano nel New England. Questo è un dubbio- meno la pianta che ha così spesso è sbagliata per questa specie in questa regione. Isoctes canadensis è stata trovata in varie località dal Maine in Pennsylvania e anche in Ontario e British Columbia. È senza dubbio più abbondante di quanto lo è attualmente noto per essere. E' cresce in acque poco profonde nei fiumi. T'egli River-Bank ^illwort. Il fiume-bank quillwort {Isoctcs riparia) era

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. The fern allies of North America north of Mexico. Pteridophyta; Botany. THE AMPHIBIOUS QUILLWORT. 239 of Isoctcs Canadensis; but it is probable that Isoctcs riparia does not occur in New England. This is doubt- less the plant that has so frequently been mistaken for that species in this region. Isoctes Canadensis has been found in various localities from Maine to Pennsylvania, and also in Ontario and British Columbia. It is doubtless more abundant than it is at present known to be. It' grows in shallow water in rivers. T'he River-Bank ^illwort. The river-bank quillwort {Isoctcs riparia) was found near Philadelphia by Nuttallin i8i5, but, as was usual in those days, it was referred to the common European Isoetes lacustris, and it was not until thirty years afterward that its distinctness was recognised and the name it now bears ^'as assigned to it. Isoctcs 7-iparia is a medium-sized species with from fifteen to thirty round leaves that oc- casionally reach a length of a foot, but are commonly several inches shorter. The leaves have abundant stomata, are without bast bundles, and the sporangia are spotted and about one third indu- r^. ^ Megaspore of Slate, i he megaspores are 45O/" to 050/" isocus riparia. in diameter, with thin, jagged, irregular crests that so nearly resemble those of both Isoctes lacnstris and Isoetes Tiickcrmani that good students of the genus can- not always agree as to their identity. They maj/ usually be distinguished from Isoetes Tuckerniani, however, by the crests being more numerous, thicker, and longer, and from Isoetes lacnstris by the crested commissures.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Clute, Willard Nelson, b. 1869. New York, F. A. Stokes

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectbotany
• bookyear1905