Observation 57834: Lichen P. Micheli
When: 2010-10-30
No herbarium specimen

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nice description..
By: Alok Mahendroo (alok)
2010-11-09 12:03:49 CST (-0500)

At least you’ve kept the language friendly and simple.. and not clinically technical like some I’ve come across.. What we need as a newbie is step by step identification guide.. like if it is a crustose then we should be looking for a),.. b),… c).. features of course remembering that newbies like me are probably starting with the macroscopic features… and of course using the friendly language.. (at least with description for newbies like you’ve tried) such keys are available for mushrooms but I’ve not seen one as yet for lichens…

excellent observation!
By: Jason Hollinger (jason)
2010-11-09 11:30:22 CST (-0500)

Yes, I’ve also noticed the rich flora on apple trees. Wish I knew why. Neutral pH but high nutrients? Also slow-growing so stable substrate? Who knows! Rocks have same thing: limestone and limestone-derived sandstones grow very different flora than granites or even relatively neutral basalts or ultramafic rocks.

If you haven’t seen it yet, I tried to give a rough primer on terminology and methods under the description for Lichen here. It’s not much, but better than nothing…

Host flora…
By: Alok Mahendroo (alok)
2010-11-09 11:12:13 CST (-0500)

Thanks for that.. I have noticed that cedar and fir have typically one or two vars of lichens… Dandal or Xylosma longifolia on which this particular one is hosted is a thin barked tree also has typically two varieties that I’ve noticed.. maximum number of variety on flora I’ve seen as yet are present on the Apple trees… or on the rocks and ground (one I’ve posted).. Will try to study the other kinds of trees too..
I am trying to study the minute features.. as yet, I have to come to terms with all the mind boggling terminology.. which for a layman like me is quite something.. but the winter months of leisure are approaching and hopefully I’ll be able to make some sense out of this… :))

host species is important
By: Jason Hollinger (jason)
2010-11-09 08:55:37 CST (-0500)

Especially for crustose lichens since much (sometimes all) of the vegetative thallus grows within the bark. I personally strongly suspect that some species, especially those growing on very thin-barked hosts, must be deriving at least some water and/or nutrients from the host, too.

Macrolichens are typically less specific. For them trees mostly just divide into two broad groups: acidic/nutrient-poor and basic/nutrient-rich. In the northern termperate this roughly corresponds to gymnosperms and angiosperms, with Populus being notably nutrient-rich and Pinus being notably acidic. But there are exceptions — Thuja plicata “pumps” nutrients into the canopy, so even though its bark is acidic, twigs of other species that occur in the drip zone beneath cedars are typically much enriched; also many angiosperms are fairly acidic, such as the Ericaceae in general.

I haven’t figured out how tropical and subtropical families behave yet, but you can readily observe that different species of trees host different assemblages of lichens. In the Caribbean I’ve noted that rough-barked trees, e.g., mahogany, usually have richer lichen communities. But is this due to chemistry or simply age/stability of the substrate (thin smooth bark stretches and/or sloughs off regularly, making it a constantly-changing substrate)?

Xylosma longifolia
By: Alok Mahendroo (alok)
2010-11-03 07:32:57 CST (-0500)

sorry forgot to add the host tree.. you can see the reference on flowersofindia.net

crusts require microscope
By: Jason Hollinger (jason)
2010-11-02 13:46:18 CST (-0500)

Definitely a lichen, but need microscopic section of apothecium and need to see spores (400x or better). A lichenologist familiar with the area might be able to make a shrewd guess, but there might not be any lichenologists in the world familiar with your crustose flora!

Created: 2010-11-02 10:38:20 CST (-0500)
Last modified: 2010-11-02 10:38:23 CST (-0500)
Viewed: 89 times, last viewed: 2016-05-23 19:54:33 CDT (-0400)
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