Collection location: Atascadero, California, USA [Click for map]
On bark of Pinus sabiniana in an oak woodland habitat.
Individual thallii very small, <<1cm, consisting of a continuous irregularly shaped green-gray, K- crust. Apothecia are common, lecanorine, with thalline margins concolorous with thallus that become somewhat reduced and darkened.
Spores 8/ascus (one apothecia has consistently 4 spores), Type A development, Physcia-type with large apical and septal swellings, angular lumina, light torus. 1-septate, brown, broadly ellipsoid. Average size 14.4×7.6 (n=7).
Spore size is on the low end for Rinodina laevigata, but Sheard (Nash Sonoran Flora V2) says “The Californian population often has smaller spores with more persistently angular lumina and sometimes better developed thalli, that may be gray rather than pale brown…It may prove to be a separate taxon upon further study.”
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What a strange specimen.
I looked at that spore an shrugged, figuring it was just some sort of defect. One apothecial section had only 4 spores in every ascus. Again, I just shrugged and figured it was just a defect of some sort.
One of the spores (just above dead center in last photo) shows apical thickenings but no septum — clear type-B development. Must just be a freak error. Nice photos!
Created: 2018-01-09 11:29:47 PST (-0800)
Last modified: 2018-01-09 15:43:16 PST (-0800)
Viewed: 48 times, last viewed: 2020-08-23 22:49:38 PDT (-0700)