|
knee root |
|
STRUCTURE |
|
A specialized secondary root of a wetland tree, a portion of which projects above mean water level and appears to bend as a leg does at the knee, its distalmost portion being anchored in the substrate beneath the water. The knee of the root is commonly regarded as a conduit for gas exchange between root interior and atmosphere, a function whose need is posited on the basis of the highly anaerobic and saturated conditions prevailing in wetland substrates. |
|
lenticel |
|
STRUCTURE |
|
A specialized, anatomically distinct structure within the periderm of a stem, consisting of comparatively spongy, sometimes suberized tissue distinct from others of the periderm; extending radially through the periderm and visible as a circular to elongate discontinuity in the color, texture, and/or relief of the outer surface of the stem; serving as a conduit for gas exchange between the stem interior and the atmosphere. |
|
macrosporangium pl. macrosporangia (not recommended) |
= megasporangium |
STRUCTURE |
|
A sporangium that produces megaspores. |
|
megasporangium pl. megasporangia |
= macrosporangium (not recommended) |
STRUCTURE |
|
A sporangium that produces megaspores. |
|
microsporangium pl. microsporangia |
|
STRUCTURE |
|
A sporangium that produces microspores. |
|
spore case |
= sporangium |
STRUCTURE |
|
A spore-producing organ; basically capsular, often supported by a slender stalk (sporangiophore), often lidded (operculate). In Bryophyta and Polypodiophyta, a distinct portion of the sporangial wall effects regular dehiscence at maturity. Spore cases or their equivalents are also present, but of little or no descriptive significance, in seed plants. |
|
sporangium pl. sporangia |
= spore case |
STRUCTURE |
|
A spore-producing organ; basically capsular, often supported by a slender stalk (sporangiophore), often operculate (lidded). In Bryophyta and Polypodiophyta, a distinct portion of the sporangial wall effects regular dehiscence at maturity. Sporangia or their equivalents are also present, but of little or no descriptive significance, in seed plants. |
|
macrosporocarp (not recommended) |
= megasporocarp |
STRUCTURE |
|
A sporocarp that bears only macrosporangia (megasporangia). |
|
megasporocarp |
= macrosporocarp (not recommended) |
STRUCTURE |
|
A sporocarp that bears only megasporangia. |
|
microsporocarp |
|
STRUCTURE |
|
A sporocarp that bears only microsporangia. |
|
macrosporophyll (not recommended) |
= megasporophyll; > carpel, cone scale, ovuliferous scale |
STRUCTURE |
|
A sporophyll that bears only megasporangia and, in Pinophyta, naked ovules that develop subsequently. |
|
megasporophyll |
= macrosporophyll (not recommended); > carpel, cone scale, ovuliferous scale |
STRUCTURE |
|
A sporophyll that bears only megasporangia and, in Pinophyta, naked ovules that develop subsequently. |
|
microsporophyll |
> cone scale |
STRUCTURE |
|
A sporophyll that bears only microsporangia. |
|
stipe 2 (broad sense, not recommended) |
< stalk; > gynophore, hypogynium, peduncle, petiole |
STRUCTURE |
|
A stalk of or supporting a frond, inflorescence, or gynoecium. |
|
androphore |
>< stalk |
STRUCTURE |
|
A stalk or tube that rises above the level of perianth insertion and bears the distinct portions of the androecium from its summit; as in Malvaceae, where the androphore is a tube formed by connation of the filaments. |
|
funicle |
= funiculus; < stalk |
STRUCTURE |
|
A stalk that attaches an ovule to a placenta of the ovary wall. |
|
funiculus pl. funiculi |
= funicle; < stalk |
STRUCTURE |
|
A stalk that attaches an ovule to a placenta of the ovary wall. |
|
sporangiophore |
< stalk |
STRUCTURE |
|
A stalk that bears one or more sporangia. |
|
androgynophore |
< stalk |
STRUCTURE |
|
A stalk that rises above the level of perianth insertion and bears the free portions of both androecium and gynoecium from its summit; as in Passifloraceae. |
|
rhizophore |
|
STRUCTURE |
|
A stem branch that bears no leaves and from which roots eventually arise; esp. in Selaginellaceae. |
|
culm |
< cane, stem |
STRUCTURE |
|
A stem of a sedge (Cyperaceae) or grass (Poaceae), usually hollow. Use of this term or cane instead of stem is a matter of tradition and preference, not of descriptive precision or necessity. |
|
cladode |
= cladophyll, phylloclade |
STRUCTURE |
|
A stem segment that functions as a leaf; often more or less compressed. |
|
cladophyll |
= cladode, phylloclade |
STRUCTURE |
|
A stem segment that functions as a leaf; often more or less compressed. |
|
phylloclade |
= cladode, cladophyll |
STRUCTURE |
|
A stem segment that functions as a leaf; often more or less compressed. |
|
phyllopodium pl. phyllopodia |
|
STRUCTURE |
|
A stem-like axis composed of fused leaf bases; esp. in Arecaceae (Palmae), Musaceae. |
