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Myelochroa entotheiochroa
(Hue) Elix & Hale, Mycotaxon
29: 240 (1987).
Syn.:
Parmelia entotheiochroa
Hue. Nouv. Arch. Mus. Hist.
Nat. Paris, sér.3. 1:161 (1899).
Description:
Thallus 4–6 cm
wide, loosely adnate to overlapping, lobes 3–5 mm wide,
entire with ciliate margins; upper surface mineral grey to
yellowish, strongly wrinkled and ridged in older parts,
flaking to expose yellow medulla; lower surface black with
simple to squarrosely branched rhizines. Cortex K+ yellow;
atranorin. Medulla K–, C–, KC–, P-; zeorin, leucotylic acid,
leucotylin and related triterpenoids, secalonic acid.
M.
irrugans
lacks the conspicuously rugose upper surface and
has a paler yellow medulla and laminal lobules.
Ecology and
distribution:
This saxicolous and corticolous species was
found in the Chiang Mai Province (Maetung District) on bark
at 1000 m. Reported from Korea, Japan, Nepal
(KUROKAWA & ARAKAWA 1997), Thailand (MOON et
al. 2000b; WOLSELEY et al. 2002) and India (DIVAKAR &
UPRETI 2005).
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Medulla pale yellow to white. Older parts becoming foveolate
Myelochroa irrugans (Nyl.) Elix & Hale
Myelochroa irrugans
(Hue) Elix & Hale, Mycotaxon 29: 241
(1987).
Syn.:
Parmelia irrugans
Nyl., Lich. Jap. 26 (1890).
Description:
Thallus 4–10 cm wide, loosely adnate to
imbricate, lobes 2–4 mm wide with dentate to crenulate
margins with short cilia in lobe axils; upper surface greenish
mineral grey to yellowish grey, older parts becoming
foveolate, developing c. 1 mm wide lobules; medulla pale–
yellow to white; lower surface brown to black, rhizines
simple to squarrosely branched. Cortex K+ yellow; atranorin.
Medulla K–, C–, KC–, P-; zeorin, leucotylic acid, leucotylin
and related triterpenoids, secalonic acid (minor).
Distinguished from
M. entotheiochroa
by the presence of
laminal lobules on the older parts and the absence of a
heavily wrinkled and rugose upper surface, and from
M.
siamea
which has galbinic acid (K+ yellow, P+ orange–red).
Ecology and distribution:
Rare on twigs in a moss forest
around a montane bog at 2590 m in Chiang Mai Province,
Doi Inthanon National Park. Asian distribution: reported
from Japan, Korea, Saghalien, China, Taiwan, Nepal,
Thailand (KUROKAWA & LAI 2001; WOLSELEY et al.
2002) and India (DIVAKAR & UPRETI 2005).
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Medulla K-, KC-
Myelochroa siamea Kurok.
Myelochroa siamea
Kurok., J. Jap. Bot. 73: 13 (1998).
Description:
Thallus adnate, 2–3 cm. wide, lobes
overlapping, 1.5–3.0 mm wide, margins rounded, crenate,
sparsely ciliate mainly in the axils; upper surface mineral
grey becoming minutely rugulose on older lobes; medulla
yellow; lower surface black with dense, simple to sparsely
squarrose rhizines. Cortex K+ yellow; (atranorin). Medulla
K–, C–, KC–, P+ orange red; zeorin related triterpenoids,
galbinic acid (major), secalonic acid (trace). Distinguished
from
M. irrugans
by the conspicuously yellow medulla and
the presence of galbinic acid.
Ecology and distribution:
Only found in Thailand, in Chiang Mai Province on bark in
oak/chestnut and evergreen forests, from 960 to 1500 m.
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Medulla K+, KC+ orange
Myelochroa subaurulenta (Nyl.) Elix & Hale