
1) Cluster of plant spores 2) Cluster on a fern 3) Fern cluster 4) Fern-frond formation 5) Fungal spore mass 6) Reproductive structure 7) Spore cluster 8) Spore cluster of a fern
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https://www.crosswordclues.com/clue/sorus

A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. This New Latin word is from Ancient Greek σωρός (sōrós ‘stack, pile, heap’). In fungi and lichens, the sorus is surrounded by an external layer. In some red algae it may take the form of a depression into the thallus. In ferns, ...
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http://en.wikipedia.org/wiki/Sorus

a discrete aggregate of sporangia in ferns. pl. sori
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http://florabase.dpaw.wa.gov.au/help/glossary

A cluster or mass of spores or sporangia. (Pl. sori.)
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http://ppathw3.cals.cornell.edu/glossary/Defs_S.htm

• (n.) In lichens, a heap of soredia on the thallus. • (n.) In parasitic fungi, any mass of spores bursting through the epidermis of a host plant. • (n.) One of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns.
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http://thinkexist.com/dictionary/meaning/sorus/

in botany, brownish or yellowish cluster of spore-producing structures (sporangia) usually located on the lower surface of fern leaves. A sorus may ... [2 related articles]
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http://www.britannica.com/eb/a-z/s/128

A cluster of sporangia, generally enclosed by an indusium.
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http://www.encyclo.co.uk/local/20637

A group of sporangia or spore cases, for example on the underside of fern leaves. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

A tiny cluster of sporangia borne on ferns. (pl. sort)
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http://www.encyclo.co.uk/local/22034

A structure found in ferns that contains the spore-producing sporangia.
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http://www.encyclo.co.uk/local/22037

A group of sporangia or spore cases, eg. on the underside of fern leaves.
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http://www.encyclo.co.uk/visitor-contributions.php
So'rus noun ;
plural Sori . [ New Latin , from Greek ... a heap.]
(Botany) One of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns.
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http://www.encyclo.co.uk/webster/S/148
So'rus noun (a) In parasitic fungi, any mass of spores bursting through the epidermis of a host plant.
(b) In lichens, a heap of soredia on the thallus.
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http://www.encyclo.co.uk/webster/S/148

A heap or cluster
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http://www.gardenology.org/wiki/Glossary_of_Gardening_Terms

A sorus (plural sori) is a cluster of sporangia found on the under-surface of certain fern leaves.
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http://www.probertencyclopaedia.com/browse/BSB.HTM

[
n] - a spore-producing structure in certain lichens and fungi 2. [n] - cluster of sporangia usually on underside of a fern frond
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http://www.webdictionary.co.uk/definition.php?query=sorus

In ferns, a group of sporangia, the reproductive structures that produce spores. They occur on the lower surface of fern fronds
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https://www.encyclo.co.uk/local/21221
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