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costa
(redirected from costae)

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.01 sec.
costa /cos·ta/ (kos´tah) [L.]
1. a rib.
2. a thin, firm, rodlike structure running along the base of the undulating membrane of certain flagellates.cos´tal

cos·ta (kst)
n. pl. cos·tae (-t)
1. Rib.
2. A rodlike internal supporting organelle that runs along the base of the undulating membrane of certain flagellate parasites. Also called basal rod.

costal adj.

costa
[kos′tə] pl. costae [kos′tē]
a rib.

costa [kos´tah] (L.)
a rib. adj., adj cos´tal.

costa
pl. costae [L.] a rib.


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Adiantum tricholepis differs from the other two species by laminae ovate to deltate and 3-4 pinnate, the acroscopic basal pinnules not overlapping the main rachis, the rachis and costae glabrous, and the apex of the stalks not or lightly enlarged (Moran et al.
The ornament consists of 12-14 costae appearing close to the umbo, increasing to 30 by branching along the margins.
 
 
 
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