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p.1 #1 · p.1 #1 · Physcia tenella a Lichen on Young Twigs of Pear | |
I found this species, which is new to me, although not uncommon and one of our elderly pear trees. Lichen takes years to grow, so I would have expected to find it on the older branches. However, it was only on a few of the younger tip growths of the tree. (The tree is maybe 50 feet high so I cannot verify that the lichen is so restricted in its colonisation).
Lichens are supposed to be referred to as lichenised fungi. The fungus lives as a symbiont with an alga, forming a thallus, which is leaf-like in this “foliose” type.
This genus is in the greyish to bluish thallus group. This species has the soredia in soralia at the tips of branches of the thallus. Soredia are not spores but tiny capsules containing the complete lichen ingredients, fundal hyphae and some cells of algae. The aggregations of these soredia are called soralia and the locations of these on the thallus are specific to genera or species. These look like tiny spheroids in a tightly-packed group.
Most of these were growing at just above my head height, balancing on a knee-hight stoll being my access. Some colonies were on twigs which had become detached at an earlier date and I did pick one for close work.
Most images are with FOV 6-8mm wide.
Olympus EM-1, Olympus 4/3 x2 TC, Olympus 4/3 50mm f2 macro, Raynox MSN-202 25 diopters, twin or triple TTL RC flash, hand-held. Wider views with other combinations or just the 50mm.
Harold
Harold Gough 2017
Harold Gough 2017
Harold Gough 2017
Harold Gough 2017
Crop
Harold Gough 2017
Harold Gough 2017
Edited on May 09, 2017 at 02:28 AM · View previous versions
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