. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 322 THE KINDS OF PLANTS B. Sporangia large and globose, without a ring of special cells running around their margin 1. Osmunda BB. Sporangia with a ring of prominent elastic cells run- ning around the margin, and which are concerned in the dehiscence 2. Onoclea AA. Fruit borne on the back of green fronds (the fruiting pinnse sometimes narrowed but still leaf-like), sporan- gia with a ring of elastic cells. B. Sori naked (no indusium) 3. Polypodium BB. Sori borne under the reflexed margins of
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 322 THE KINDS OF PLANTS B. Sporangia large and globose, without a ring of special cells running around their margin 1. Osmunda BB. Sporangia with a ring of prominent elastic cells run- ning around the margin, and which are concerned in the dehiscence 2. Onoclea AA. Fruit borne on the back of green fronds (the fruiting pinnse sometimes narrowed but still leaf-like), sporan- gia with a ring of elastic cells. B. Sori naked (no indusium) 3. Polypodium BB. Sori borne under the reflexed margins of the frond. C. Pinnse entire on the lower edge, somewhat trian- gular in outline 4. Adiantum CC. Pinnse toothed on both margins, oblong in Pteris BBB. Sori covered with a distinct scale-like indusium. c. Shape of sori 6. Asplenium cc. Shape circular. D. Indusium circular-peltate, without a sinus 7. Polystichum dd. Indusium reniform, or if circular with a narrow sinus 8. Aspidium 1. OSMUNDA. Flowering Fern. Strong ferns from stout creeping rootstocks, with large, pinnate fronds: sporangia covered with interwoven ridges, but wanting the elastic ring of most ferns. Inhabitants of bogs and wet woods. O. regalis, Linn. Royal fern. Top of the frond contracted into a fruit- ing panicle: frond 2-pin- nate, the pinnae oblong, ob- tuse, and nearly entire. O. Claytoniana, Linn. - â <*$*?'*' ^g- 4^9- ^wo to *°ur Pa^rs "^MffiJ0$w ^^jffi&ftK °f Pmnse near tne middle \""'!i^*';' of the frond contracted into v?*&0*&fo,V*:^1* fruit-bearing parts: pinnse linear-lanceolate and acute, deeply lobed. 0. cinnamomea, Linn. 479. Osmunda Claytoniana (left). Osmunda cinnamon fern. Fig. 479. cinnamomea. ' . Some fronds entirely con- tracted into fruiting parts, and these cinnamon colored (whence the ver- nacular name): sterile form with the fronds much like those of 0. Clay- toniana in shape except more acute at top. 2. ONOCLEA. Sensitive Fern. M
Size: 1858px × 1345px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
