Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A cluster of sporangia borne on the underside of a fern frond.
- n. A reproductive structure in certain fungi and lichens.
Century Dictionary and Cyclopedia
- n. In botany, a heap or aggregation. One of the fruit-dots or clusters of sporangia (spore-cases) on the back of the fronds of ferns, also on the mucilaginous cord emitted from the sporocarp of Marsilea. etc. They are of various forms and variously arranged. In the Acrostichete the sporangia are spread in a stratum over the under surface, or rarely over both surfaces, of the frond: in the Polypodieæ the sori are dorsal, and are borne at or near the ends of the veinlets; in the Vittarieæ they are borne in continuous marginal or intramarginal furrows; in the Pterideæ they are marginal or intramarginal, and covered by the reflexed margin of the frond; in the Blechneæ they are dorsal, linear or oblong, and parallel to the midrib; in the A splenieæ they are also dorsal, and linear or oblong, but oblique to the midrib; and in the Aspidiæ they are dorsal, round or roundish, and usually on the back of a vein. In most instances the sori are covered with a projecting section of the epidermis, which is called the indusium and forms an important character in the systematic arrangement of ferns. See
fern , paraphysis, sporangium, etc. See also cuts under indusium, Cystopteris, Nothochlæna, polypody, and Marsilea
Wiktionary
- n. botany Any reproductive structure, in some lichens and fungi that produces spores
- n. botany A cluster of sporangia on the edge or underside of a fern frond
GNU Webster's 1913
- n. (Bot.) One of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns.
- n. In parasitic fungi, any mass of spores bursting through the epidermis of a host plant.
- n. In lichens, a heap of soredia on the thallus.
WordNet 3.0
- n. cluster of sporangia usually on underside of a fern frond
- n. a spore-producing structure in certain lichens and fungi
Etymologies
- New Latin sōrus, from Greek sōros, heap; see teuə- in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Indusium cup-shaped, fixed beneath the sorus, supported by the tooth of a leaf; sporangia borne in an elevated, globular receptacle open at the top.”
The Fern Lover's Companion A Guide for the Northeastern States and Canada
“Indusium minute, concealed beneath the sorus, divided into a few beaded hairs.”
The Fern Lover's Companion A Guide for the Northeastern States and Canada
“Sori (singular _sorus_, a heap), or fruit dots may be naked as in the polypody, but are usually covered with a thin, delicate membrane, known as the indusium (Greek, a dress, or mantle).”
The Fern Lover's Companion A Guide for the Northeastern States and Canada
“Indusium hood-shaped, fixed centrally behind the sorus and arching over it, soon withering, often illusive.”
The Fern Lover's Companion A Guide for the Northeastern States and Canada
“Indusium star-shaped, of a few irregular segments fixed beneath the sorus, often obscure.”
The Fern Lover's Companion A Guide for the Northeastern States and Canada
“This occasionally happens from the elongation of the normally placed sorus, which thus extends to the margin, and returns on the upper side, when the sori chance to be placed opposite to the marginal crenatures.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“Like the plasmodial slime mold, the pseudoplasmodium looks for a light, dry area to form the frutification, which is called a sorocarp and consists of a sorophore (the stalk) and a sorus”
“Like the plasmodial slime mold, the pseudoplasmodium looks for a light, dry are to form the frutification, which is called a sorocarp and consists of a sorophore (the stalk) and a sorus”
“Sori sunt continui ut in Pteride, pro qua facile habetur, sed character yidianti: sorus nempe indusio insertus, non aegre deprehenditur.”
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