Observation 10114: Candelaria pacifica M. Westb. & Arup
When: 2008-08-25
Herbarium specimen reported

Notes: microscopically fruticose lichen, on rough elm bark, probably enriched by bird droppings
THALLUS: bright yellow-orange, leprose to minutely subfruticose, very few lobes intact, undersurface quicky breaking up into granular soredia, lobes ascending
APOTHECIA: rare, lecanorine, orange, epihymenium brown, hymenium clear and IKI-, hypothecium clear, algae abundant under and in rims, paraphyses abundant and simple with rounded subclavate tips, asci clavate to balloon-shaped at maturity, thollus indented inside, thick IKI- wall and IKI- lens inside thollus that doesn’t seem to penetrate completely, cortex weakly K+ golden, epihymenium shows minute POL+ golden crystals/granules
SPORES: 8 per ascus, clear, 1 cell, oblong, smooth, IKI+ reddish, 12-16 × 3-5 µm Q=2.8-5.3 (N=10)

This is apparently a common species, that was until recently included in Candelaria concolor. However the soredia and number / size of spores clearly distinguish it.

In Pasadena, look for it just north of Heatherside on Linda Vista. It almost completely covers one of the trees on the west side of the street… but you have to be headed south to see it!

Images

18773
18774
10x magnification.
18775
30x magnification
18776
Apothecial section, mounted in water, at 100×.
18777
Apothecial section, mounted in water, at 400×.
18778
Apothecial section, mounted in water, at 400×. Cortical pigments clearly visible in cross-polarized light!
18779
Ascus, stained with Lugol’s, at 1000×. Shows thollus structure nicely.
18780
Ascus and spores, stained with Lugol’s, at 1000×. Not very clear, but you get the idea — definitely fewer than 30 spores here!

Proposed Names

87% (1)
Eye3 Eyes3
Recognized by sight: soredia on lower surface
Used references: Nash’s Sonoran Flora
Based on microscopic features: spore number and size
Based on chemical features: weak K reaction

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-08-27 12:28:04 PDT (-0700)
Last modified: 2008-08-27 12:28:04 PDT (-0700)
Viewed: 307 times, last viewed: 2017-06-23 17:25:28 PDT (-0700)