Observation 34510: Cladonia didyma (Fée) Vainio
When: 2010-02-21
Herbarium specimen reported

Notes: Location: 35°13’21.51"N, 85°57’3.86"W, el. 572 m, Rutledge Point Trail.

Substrate and habitat: Growing on thin, sandy soil covering a nearly completely decomposed log, almost level with the forest floor, in oak-dominated eastern deciduous woodland near the western rim of the Cumberland Plateau.

podetia: K+ yellow (press damp K+ yellow area against white, absorbent paper for a better read), Pd+ bright yellow immediately (on the undersides of flaring podetial squamules, becoming deep orange along the undersides of outer podetial squamule margins at junction with upper cortex). However, several podetia showed no such chemical reactions.

Identification: The podetia of Cladonia didyma are covered with granular to flaring squamules, sometimes enclosing irregular, elongate, pale to brownish, ecorticate patches; thallus squamules are finely incised and esorediate (Hinds and Hinds, 2005, p.179). In Cladonia macilenta the podetia have “well-developed farinose soredia” and the thallus squamules are sorediate (Harris and Ladd, 2005, p.97).

Sharnoff’s Cladonia didyma gallery
CNALH images, description, and locality map, and a larger, interactive locality map. You may have to click a few times to see the larger map.

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Rutledge Point Trail. 21 Feb 2010. Chris Parrish 0062, det. James C. Lendemer (NY).

Common name: southern soldiers

Species Lists


podetia, 7.1x
“queen of the prom,” podetium, 16x
podetium, 16x
squamules, 25x
squamules, 32x
taller, thinner podetium, 20x
squamules near taller, thinner podetia, 32x
squamules near taller, thinner podetia, 32x

Proposed Names

85% (1)
Eye3 Eyes3
Used references: Hinds and Hinds, 2005, p.179; Harris and Ladd, 2005, p.97. Voucher specimen identified as Cladonia didyma var. didyma by James C. Lendemer (NY).

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2010-03-04 20:53:19 PST (-0800)
Last modified: 2010-06-08 23:31:35 PDT (-0700)
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