Dyplolabia chumphonensis J. Kalb & K. Kalb, 2016

Polyiam, Jutarat Kalb Wetchasart, Plata, Eimy Rivas, Bawingan, Paulina A., Kalb, Klaus & Lücking, Robert, 2016, ‘ Missing links’ alive? Novel taxa represent morphological transitions between distinctive phenotypes among extant Graphidaceae (lichenized Ascomycota: Ostropales), Phytotaxa 268 (2), pp. 110-122 : 115-117

Dyplolabia chumphonensis J. Kalb & K. Kalb , sp. nov. ( Fig. 6E–F )

MycoBank MB817436

Differing from Dyplolabia oryzoides by smaller ascospores.

Type: — THAILAND. Chumphon province: Tasae district, Tambon Tha Sae ; area of 72 nd Anniversary Queen Sirikit Park ; 10°43’24’’ N, 99°15’43’’ E, 100 m; on a ± free standing deciduous tree; 19 March 2011, J. Sutjaritturakan 3606 (holotype RAMK 027820 ) .

Thallus corticolous, epiperidermal, yellow-olive, smooth to uneven, with dense, prosoplectenchymatous cortex; photobiont layer without or with very rare scattered clusters of calcium oxalate crystals.Apothecia erumpent, elongate-lirellate, 1–4 mm long and 0.5–0.75 mm broad, straight or curved, very rarely branched; disc immersed, thickly white-pruinose, fully covered by margin; proper margin distinct, thick, erect, black but with a very thick, white cover; thalline margin absent. Excipulum apically and laterally carbonized, jet-black, without discernable structure. Periphysoids absent but hymenium laterally with a broad zone of widely spaced, anastomosing paraphyses embedded in a gelatinous matrix. Pseudocolumella absent. Hymenium 75–110 μm high; paraphyses unbranched except for lateral areas as described above.Ascospores 4–6 (–8)/ascus, uniseriate, submuriform with 3–5 transverse and 0–1 longitudinal septa per segment, 16–19 × 8–9 μm, oval, with mostly thick septa (rarely thin septa) and diamond-shaped lumina ( Astrothelium - type), colorless, I– (non-amyloid).

Secondary chemistry: —White cover of ascoma margin C+ red (lecanoric acid).

Etymology: ―This new species is named after the Thai province where it was collected.

Distribution and ecology: ― Thailand; thus far only known a single collection from the type locality, growing on bark of a deciduous tree in a park.

Remarks: ― Dyplolabia chumphonensis is very similar to D. afzelii and D. oryzoides . The first one very rarely has one longitudinal septum per spore ( Kalb & Staiger, 2000), but is usually separated by only 4-locular ascospores without a longitudinal septum. The spores of D. oryzoides are considerably larger, 19–27 × 10–14 μm.

Figures

FIGURE 6. A. Dyplolabia dalywaiana (holotype; thallus with ascomata). B–D. D. oryzoides (B, Brazil, Kalb 31120; C, D, Sri Lanka, Weerakoon 116; thallus with ascomata and ascospores). E–F. D. chumphonensis (holotype; thallus with ascomata and ascospores). Scale = 1 mm, in D, F = 10 μm.