The lichen family Physciaceae in Thailand-I. The genus Pyxine
Author
Mongkolsuk, Pachara
Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng road 24, Bangkok, 10240 Thailand. Email: pm-tamrapap @ ru. ac. th
Author
Meesim, Sanya
Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng road 24, Bangkok, 10240 Thailand. Email: pm-tamrapap @ ru. ac. th
Author
Poengsungnoen, Vasun
Lichen Research Unit, Biology Department, Faculty of Science, Ramkhamhaeng University, Ramkhamhaeng road 24, Bangkok, 10240 Thailand. Email: pm-tamrapap @ ru. ac. th
Author
Kalb, Klaus
Lichenologisches Institut Neumarkt, Im Tal 12, D- 92318 Neumarkt, Germany. Email: klaus. kalb @ arcor. de & University of Regensburg, Institute for Botany, Universitätsstra e 31, D- 39040 Regensburg, Germany
text
Phytotaxa
2012
2012-07-13
59
1
32
54
http://biotaxa.org/Phytotaxa/article/view/phytotaxa.59.1.2
journal article
10.11646/phytotaxa.59.1.2
1179-3163
5061495
9.
Pyxine dactyloschmidtii
Kalb & Mongkolsuk
,
sp. nov.
(
Fig. 3B
)
Mycobank MB 800693
Similar to
Pyxine schmidtii
Vain.
(showing the same array of terpenes on TLC plates in solvent A, B' and C), but differing by having polysidiangia.
Holotype
:—
THAILAND
.
Loei
;
Phu Luang Wildlife Sanctuary
,
Khok Prommachan
,
Kok Nok Kraba Forest Ranger Station
, in a lower montane scrub on an unidentified tree,
1487 m
,
17°16'53'' N
,
101°31'22'' E
,
25 March 2009
,
S. Meesim
46
(
RAMK 17626
).
Thallus corticolous,
4–10 cm
wide, adnate to loosely adnate, subdichotomously lobate. Lobes radiating, discrete or rarely contiguous and imbricate, plane to distinctly convex but often slightly concave towards the tips,
0.7–1.2 mm
wide, subrotund at the apices. Upper surface grey to whitish grey, epruinose, or very faintly pruinose towards the lobe tips; isidia and soralia absent. Pseudocyphellae sparse, marginal and laminal, irregular to linear or becoming finely reticulate. Polysidiangia mainly laminal, occasionally marginal, scattered or clustered, nodular to subcylindrical or clavate, short, ± branched, pustulate, bursting apically to release corticate fragments; simulating elevated soralia when abraded. Medulla uniformly white. Lower surface black in the centre, paler towards the margin; rhizines ± dense, furcate. Apothecia common,
obscurascens
-
type
,
0.5–1.8 mm
wide; disc epruinose. Internal stipe distinct, white, K-, P-. Ascospores 16–20 ×
6–8 µm
. Pycnidia not seen.
Chemistry: Cortex K+ yellow, C-, KC-, P+ yellow, UV-; medulla K-, C-, P+ orange-red; containing atranorin (minor), chloroatranorin (minor), testacein (major), unknown terpenes (minor).
Distribution and habitat
:—Very rare on bark in a lower montane scrub.
Notes
:—This species is characterized by the adnate to loosely adnate thalli, the presence of polysidiangia, a white medulla, cortical atranorin, medullary testacein and
obscurascens
-
type
apothecia.
P. coralligera
,
P. maculata
Swinscow & Krog
(
Swinscow & Krog 1975a: 58
),
P. subcoralligera
(see below) and
P. boonpragobiana
are morphologically similar as all produce polysidiangia as vegetative propagules. While the first three species are distinguished by a coloured medulla, the latter is easily separated by the presence of norstictic acid.
P. dactyloschmidtii
shows the same array of terpenes as
P. schmidtii
and
P. asiatica
, but the former species lacks vegetative propagules while the latter has soralia.
Material from
Thailand
examined
:—
Known
only from the
type
collection
.