Difference between revisions of "Primary thallus"
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| − | '''primary thallus''' (''pl.'' primary thalli) – the first fully differentiated thallus that is formed. Most lichens only form a primary thallus, and no secondary thallus. Some genera, especially ''Cladonia'', have a crustose or squamulose primary thallus and a [[fruticose]] [[secondary thallus]]. Some predominantly crustose or foliose lichens may secondarily also develop fruticose thallus parts. For example, ''Caloplaca thamnodes'' forms a [[placodioid]] thallus in sheltered microhabitats but develops a [[coralloid]] thallus if exposed to sea spray. | + | '''primary thallus''' ([[Category:Noun]][[:Category:Noun|noun]], ''pl.'' primary thalli) – the first fully differentiated [[thallus]] that is formed. Most lichens only form a primary thallus, and no [[secondary thallus]]. Some genera, especially ''Cladonia'', have a [[crustose]] or [[squamulose]] primary thallus and a [[fruticose]] [[secondary thallus]]. Some predominantly crustose or [[foliose]] lichens may secondarily also develop fruticose thallus parts. For example, ''Caloplaca thamnodes'' forms a [[placodioid]] thallus in sheltered microhabitats but develops a [[coralloid]] thallus if exposed to sea spray. ''Related terms:'' [[general growth morphology]], [[secondary thallus]], [[horizontal thallus]], [[squamule]], [[primary squamule]]. |
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Latest revision as of 02:00, 7 December 2005
primary thallus (noun, pl. primary thalli) – the first fully differentiated thallus that is formed. Most lichens only form a primary thallus, and no secondary thallus. Some genera, especially Cladonia, have a crustose or squamulose primary thallus and a fruticose secondary thallus. Some predominantly crustose or foliose lichens may secondarily also develop fruticose thallus parts. For example, Caloplaca thamnodes forms a placodioid thallus in sheltered microhabitats but develops a coralloid thallus if exposed to sea spray. Related terms: general growth morphology, secondary thallus, horizontal thallus, squamule, primary squamule.
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