Observation 20534: Melanohalea subolivacea (Nyl.) O. Blanco et al.

When: 2009-04-23

Collection location: Peace River Area, British Columbia, Canada [Click for map]

Who: Johannes Harnisch (Johann Harnisch)

No specimen available

The dark green ones


Copyright © 2009 J.H.
Copyright © 2009 J.H.
Found on willow
Copyright © 2009 J.H.

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Add Comment
lichen morphology
By: Jason Hollinger (jason)
2009-04-23 22:59:17 PDT (-0700)

Apothecia are the fruiting bodies, exactly equivalent to the cups in Peziza for example. (They are particularly abundant in this species, it seems.)

Soredia, isidia and lobules (aka phyllidia) are all asexual propagules whereby little bits of the thallus break off, are transported to a new site, and grow into a new lichen. Vectors include wind, rain, insects, birds, people, etc.

Soredia are powdery to granular bits of generally white, cottony medulla hyphae with some algae mixed in.

Isidia are tiny outgrowths with all three layers present — cortex, medulla, and algae. They are generally distinctly shiny like the rest of the thallus, unlike soredia.

Lobules/phyllidia are larger outgrowths, sort of intermediate between isidia and the actual lobes of the lichen thallus. These are common on some species of Peltigera (P. praetextata, I think) and on some South American Pseudocyphellaria (e.g. P. flavicans), for example.

With Melanelia, the shape and size of the isidia can be very important. See, for example, Melanelia exasperatula versus Melanelia elegantula, both common in the western US where they can often be found growing together.

Is it….
By: Johannes Harnisch (Johann Harnisch)
2009-04-23 16:47:43 PDT (-0700)

is it apothesia on these?
can you explain soredia?

Created: 2009-04-23 16:32:07 PDT (-0700)
Last modified: 2009-04-23 16:32:07 PDT (-0700)
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