Pyxine cocoes
Creators: name: Mongkolsuk, Pachara
name: Meesim, Sanya
name: Poengsungnoen, Vasun
name: Kalb, Klaus
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Lecanoromycetes
Teloschistales
Physciaceae
Pyxine
Pyxine cocoes

description: <b>5.</b> <b> <i>Pyxine cocoës</i> (Sw.) Nyl.</b> , <i>Mém. Soc. Imp. Sci. Nat. Cherbourg</i> 5: 108 (1857). Type:— <i>Lichen</i> <i>cocoës</i> Sw., <i>Nova gen. spec. plant.:</i> 146 (1788);— <i>Coccocarpia pellita</i> var. <i>cocoës</i> (Sw.) Zahlbr., <i>Cat.</i> <i>lich. univ.</i> 3: 286 (1925). Holotype:— Jamaica, on <i>Cocos</i>, <i>Swartz</i> (S!; isotype:—H-ACH 379!). Thallus usually corticolous, rarely also saxicolous, 1–3 (–10) cm wide, adnate. Lobes radiating, discrete to ± contiguous, plane to slightly convex or concave, 0.4–0.8 mm wide, subrotund to truncate at the apices. Upper surface white to yellowish white, pale yellow-brown or grey, patchily pruinose; pruina glistening; polysidiangia and isidia absent. Pseudocyphellae usually restricted to the margins, rarely laminal or becoming reticulately confluent, developing into soralia with age. Soralia marginal and laminal, orbicular to linear, ± coalescing into extensive patches; soredia granular. Medulla uniformly white. Lower surface black in the centre, paler towards the periphery; rhizines ± dense, furcate. Apothecia rare, <i>cocoës</i> - type, 0.4–1.4 mm wide; disc epruinose. Internal stipe distinct, reddish brown in the upper part and K + purple, P-; lower part white, K-, P-. Ascospores 15–18 × 6–7 μm. Conidia bacilliform, 3–4 × ca. 1 μm. Chemistry: Cortex K-, UV + yellow; medulla K-, C-, KC-, P-; containing lichexanthone (major), ± unknown terpenes (traces). <b>Distribution and habitat</b>:—This very common, mainly pantropical lichen grows on rock, wood and bark in dry dipterocarp and mixed deciduous forests. <b>Notes</b>:— <i>Pyxine cocoës</i> is characterized by the cortical lichexanthone, marginal pseudocyphellae developing into coalescing soralia with rather coarsely granular soredia, the white medulla and apothecia of the <i>cocoës</i> - type with an internal stipe that is reddish brown (K+ purple) in the upper part and the patchy pruina covering large parts of the lobe tips. <b>Selected material from</b> <b>Thailand examined</b>:— Chiang Mai; Mae Rim, along a big pond called ' Huay Tueng tao Reservoir', ca. 6 km NNW of Chiang Mai, on bark in a dry dipterocarp forest, 360 m, 18°52'11'' N, 98°56'28'' E, 16 March 2008, <i>K</i> <i>.</i> <i>Kalb</i> (hb. Kalb 37099).— Loei; Phu Luang Wildlife Sanctuary, Nam Chan Forest Ranger Station, on rocks in mixed deciduous forest, 397 m, 17°20'49'' N, 101°33'29'' E, 28 July 2009, <i>S</i> <i>. Meesim &amp; K.</i> <i>Buaruang MSPL 308, 309</i> (RAMK).— Loei; Phu Luang Wildlife Sanctuary, Phu Ho Forest Ranger Station, on the trunk of <i>Bambusa bambos</i> in mixed deciduous forest, 569 m, 17°07'13'' N, 101°34'30'' E, 29 July 2009, <i>S</i> <i>. Meesim &amp; K.</i> <i>Buaruang 427</i> (RAMK).— Nakhon Ratchasima; Khao Yai National Park, Khao Noi, on the bark of <i>Wrightia lecomtei</i> in dry dipterocarp forest, 300 m, 14°10' N, 101°30' E, 2 April 1998, <i>P</i> <i>.</i> <i>Mongkolsuk 12917</i> (RAMK).— Nakhon Ratchasima; Khao Yai National Park, the trail "Kang Kao" cave Khao Lookchang site, on the bark of <i>Pterospermum aceritolium</i> in mixed deciduous forest, 1100 m, 14°32' N, 101°40' E, 6 April 1999, <i>P</i> <i>.</i> <i>Mongkolsuk 13781</i> (RAMK).— Chonburi; Panutnikom district, Tung Kwang, on the trunk of <i>Phyllanthus acidus</i> in plantation, 50 m, 13 April 2001, <i>P</i> <i>.</i> <i>Mongkolsuk 30000</i> (RAMK).
description: Published as part of <i>Mongkolsuk, Pachara, Meesim, Sanya, Poengsungnoen, Vasun &amp; Kalb, Klaus, 2012, The lichen family Physciaceae in Thailand-I. The genus Pyxine, pp. 32-54 in Phytotaxa 59 (1)</i> on page 41, DOI: 10.11646/phytotaxa.59.1.2, http://zenodo.org/record/5061495