Platygramme discurrens ( Nylander 1863: 358 ) Staiger (2002: 362)

Kalb, Jutarat & Kalb, Klaus, 2017, New lichen species from Thailand, new combinations and new additions to the Thai lichen biota, Phytotaxa 332 (2), pp. 141-156 : 149-150

Platygramme discurrens ( Nylander 1863: 358) Staiger (2002: 362) . ( Fig. 2G )

This species is distinguished by having 4–6-trans-septate ascospores, 15–23 × 5–7 μm, entire labia and a basally hyaline to light brown exciple.

Selected material from Thailand examined (42 specimens collected):— Chumphon province: Thung Tako district, in the area of tambon Pak Tako, on trunk of Ficus benjamina , 20 m, 10°05’48” N, 99°08’42” E, 6 September April 2008, J. Sutjaritturakan 1457 (Hb. K. & J. Kalb); Pathio district, tambon Chum Cho, forest on the right hand side of the road, about 600 m from tri-section to Bangson Bay, on bark of unidentified tree, 25 m, 10°26’31” N, 99°26’46” E, 5 April 2009, J. Sutjaritturakan 1981 (Hb. K. & J. Kalb); forest on the right hand side of the road, about 500 m from tri-section to Bangson Bay, on bark of an unidentified tree, 20 m, 10°26’28” N, 99°13’54” E, 10 April 2009, J. Sutjaritturakan 2307, 2311, 2322, 2332, 2333, 2341, 2342 & 2344 (Hb. K. & J. Kalb).— Ranong province: E of Ranong Airport at Phetkasem road (Road No. 4) on free standing deciduous trees, 35 m, 9°46’00’’ N, 98°35’38’’ E, 6 June 2015, J. Sutjaritturakan & K. Kalb 41478 (Hb. K. Kalb)— Phang Nga province: Takua Pa district, tambon Khuek Khak, Samnaksong Bandokdang, at Phetkasem Road (Road Nr. 4), a few km S of Bangsak village, on bark of a deciduous tree in a secondary forest, 45 m, 8°45’35’’ N, 98°19’13’’ E, 8 June 2015, J. Sutjaritturakan & K. Kalb 41497 (Hb. K. Kalb)— Phuket province: Mueang district, in the area of Khao To Sae forest, on unidentified tree, 170 m, 07°53’58” N, 98°23’58” E, 24 April 2012, J. Sutjaritturakan & N. Sutjaritturakan 4153, 4154, 4155 & 4158 (Hb. K. & J. Kalb); 175 m, 07°53’58” N, 98°23’58” E, 24 April 2012, J. Sutjaritturakan & N. Sutjaritturakan 4159, 4175 & 4181 (Hb. K. & J. Kalb).—Patthalung province: Srinagarindra district, on the side road to Khaokram waterfall, on Parkia speciosa , 70 m, 07°31’23” N, 99°52’47” E, 28 May 2012, J. Sutjaritturakan & S. Siemmai 4651 & 4654 (Hb. K. & J. Kalb).— Nakhon Si Thammarat province: Lan Saka district, tambon Khao Kaew, in front of Kasemsomran waterside, on Parkia speciosa , 125 m, 08°20’43” N, 99°43’13” E, 15 October 2012, J. Sutjaritturakan & N. Sutjaritturakan 4890 (Hb. K. & J. Kalb); Thung Yai district, Ban Kuanlumpoo, on trunk of Azadirachta excelsa , 44 m, 08°20’46” N, 99°28’30” E, 15 October 2012, J. Sutjaritturakan & N. Sutjaritturakan 4895 (Hb. K. & J. Kalb)— Trang province: Palian district, along trail near Ton Tae waterfall, on trunk of Barringtonia acutangula , 110 m, 07°17’41” N, 99°52’56” E, 23 May 2009, J. Sutjaritturakan & S. Siemmai 2871 & 3023 (Hb. K. & J. Kalb).

Remarks:—Only two Platygramme species are described with trans-septate ascospores and with stictic acid in the thallus, viz. P. discurrens and P. microspora . Both occur in Thailand, and although very common, P. discurrens was not previously reported from Thailand. For differences between the two closely related species see the key below.

Figures

FIGURE 2. A. Graphis indica (J.K. & K.K, KJK 41769; scale 1 mm); B. Leucodecton occultum (J.K. & K.K, KJK 41952; scale 0.25 mm); C. Phaeographopsis palaeotropica, ascomata with a distinct black mazaedium (J.K. & K.K, KJK 41398; scale 0.5 mm); D. Phaeographopsis palaeotropica, ascomata lacking a mazaedium (J.K. & K.K, KJK 41395; scale 0.4 mm); E. Platygramme australis (J.K. & K.K, KJK 41279; scale 0.5 mm); F. Platygramme commutabilis (Sutjaritturakan 4225, KJK 42227; scale 1 mm); G. Platygramme discurrens (Sutjaritturakan 4895, KJK 42217; scale 0.3 mm); H. Platygramme subcolubrosa (J.S. & K.K., KK 41534; scale 0.5 mm).