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Medulla C-
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Medulla K+ dirty brown, P+ brick red
(protocetraric)
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Medulla K-, P-
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Thallus with dentate to laciniate margins. Spores 24-26
µ
m long (rarely larger).
Conidia not seen
Parmotrema merrillii (Vain.) Hale
Parmotrema merrillii
(Vain.) Hale, Contr. U.S. Natl. Herb.
36: 298 (1965).
Syn.:
Parmelia merrillii
Vain., Philipp. J. Sci. 4: 658 (1909).
Description:
Thallus loosely adnate, up to 15 cm wide, lobes
subirregular to sublinear, up to 1 cm wide with dentate–
laciniate, sparsely ciliate (cilia 0.5–2 mm long) margins;
upper surface mineral grey, lacking isidia and soredia; lower
surface black with brown marginal zone, rhizines sparse to
moderately dense. Cortex K+ yellow; atranorin. Medulla K+
dirty brown, C–, KC+ pink–red, P+ brick red; protocetraric
acid (major) and other traces. Distinguished from
P.
platyphyllinum
by the dentate–laciniate, marginally ciliate
lobes.
Ecology and distribution:
A new record for Thailand,
where it occurs in Chiang Mai Province, on bark in evergreen
forests, between 700 and 1500 m. Reported from Indonesia,
the Philippines, South America (HALE 1965), Papua New
Guinea (LOUWHOFF & ELIX 1999) and Australia
(McCARTHY 2008).
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Thallus with rounded lobes or lobules. Spores 18-22
µ
m long. Conidia sublageniform
Parmotrema overeemii (Zahlbr.) Elix
Parmotrema overeemii
(Zahlbr.) Elix, Australas. Lichenol.
42: 22-27 (1998).
Syn:
Parmelia overeemii
Zahlbr., Annals Cryptog. Exot.
1(2): 204 (1928).
Description:
Thallus moderately to loosely
adnate, membranaceous, up to 10 cm wide; lobes subirregular
to sublinear, ciliate (cilia 0.5–1.5 mm long); upper surface
pale yellow grey to grey green, parly blackened, emaculate,
smooth to more or less reticulately cracked, lacking isidia and
soredia; lower surface black with brown marginal zone;
rhizines moderately dense, simple. Cortex K+ yellow;
atranorin. Medulla K+ dirty brown, C–, KC+ pink–red, P+
brick red; protocetraric acid (major) and other traces.
Ecology and distribution:
Reported as new to Thailand
from Chiang Mai Province, Queen Sirikit Botanic Garden, on
bark in a dipterocarp forest at 700 m by POOPRANG et al.
(1999); we have not examined the specimen. It is a
widespread species, known from Africa, the Americas, and
from Asia (Indonesia, Laos, Philippines, Taiwan) and the
Pacific (HALE 1965).
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Medulla UV- (norlobaridone)
Parmotrema abessinicum (Kremp.) Hale