. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 44a PRIMARY ARRANGEMENT OF TISSUES, Taxineae, the genera Saxegothea, Dacrydiuin, Podocarpus (excepting the section Nageia), and Tsuga with exception of T. Douglasii Carr.—there is one constant resin-passage between the bundle and the epidermis of the lower surface of the leaf, either close to the latter, often as a keel or ridge projecting outwards as in species of Juniperus, Thuja, and Biota, or deeply embedded near to the bundle, as in Cunninghamia (Fig. 191). Besides these there are in many s
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. 44a PRIMARY ARRANGEMENT OF TISSUES, Taxineae, the genera Saxegothea, Dacrydiuin, Podocarpus (excepting the section Nageia), and Tsuga with exception of T. Douglasii Carr.—there is one constant resin-passage between the bundle and the epidermis of the lower surface of the leaf, either close to the latter, often as a keel or ridge projecting outwards as in species of Juniperus, Thuja, and Biota, or deeply embedded near to the bundle, as in Cunninghamia (Fig. 191). Besides these there are in many species (e. g. Cryptomeria) accessory passages corresponding in their arrangement to those which are constant in the Abietineae. One of these lies (with the exception as above of Tsuga) at each lateral margin of the leaf close to the upper surface; either this alone is present, always in Larix and Cedrus, or three are also accessory ones in the hypoderma, the number and arrangement of which vary. passage T^l^^SrSTbreL ?tV '""f"': "="«." ""°"«'' '"^ '=='' '=="'• " '"V^'- ' "PP" ^"*« i * '^^'^ at its man;m to4rd"tS p„™chymn^^^^ '=?"" ^""==^"; '^ '"= ">i°-"aUed phloem, the white band ph, ;LT/^:„S"rato:"^cl\me Sron^'eler"'""' "'"""''^ "=^"= °' "" aiT^S^K ^''^ '•'"fu ^'"!'"'J'^'d"^': e. g. in the needles of Pinus sylvestris to such an extent that 1-22 of them have been observed. ^ii^'"'^"-"^ Sciadopitys 4-10 passages lie under the epidermis, which are dis- or double lelver^ symmetry over the margin and lower sides in relation to the simple traTer^sed f ^/^"'^™'°^"""^''^' ^"'^ Ginkgo, with several vascular bundles, are the same plan! "" "^"^ P^^^^S^ ^
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
