New or otherwise interesting Lichens. VI, including a lichenicolous fungus
Kalb, Klaus
Buaruang, Kawinnat
Mongkolsuk, Pachara
Boonpragob, Kansri
Phytotaxa
2012
2012-01-25
42
35
47
3XQ9F
Kalb & Mongkolsuk
Kalb & Mongkolsuk
2012
[151,632,461,487]
Lecanoromycetes
Malmideaceae
Malmidea
Fungi
Lecanorales
9
44
Ascomycota
species
tratiana
sp. nov.
Sicut Malmidea furfurosa (Tuck. ex Nyl.) Kalb & Lückingsed thallo leve et sporis minoribus differt.
Type:— THAILAND. Trat Province: Muang District, near Ban Nam Chieo, in a ± disturbed mangrove forest on Rhizophora apiculata, ± 3 m, 12°10’25’’ N, 102°28’37’’ E, 25 February 2011, K. Kalb & P. Mongkolsuk ( holotype RAMK, isotype hb. Kalb 38852).
Etymology:—This species is named after the typelocality in Trat Province.
Thallus crustose, corticolous, continuous, 150–250 µmthick, ± smooth or slightly bullate, green to greengrey, phenocortex ca. 10–15 µmthick with small crystals, algal layer 80–100 µmthick, medulla indistinct, ca. 60–150 µmthick, prothallus whitish, soralia and isidia absent. Photobiont chlorococcoid, cells 7–10 µmdiam. Apothecia sessile, round, 0.3–0.5 mmdiam. and 0.25–0.35 µmhigh; disc plane to slightly concave, pale leather brown to grey-brown; margin of piperis- type( Kalb et al.2011), thick, prominent, black. Thalline exciple absent, proper exciple dark brown internally, outer part ± hyaline, 45–100 µm wide without hydrophobic granules, KOH-. Hypothecium 70–100 µmhigh, blackish brown, KOH-. Epihymenium hyaline. Hymenium 70–80 µmhigh, hyaline. Asci 60–70 × 15–18 µm, 6–8 spored. Ascospores non-septate, wall uniformly thickened, halonate, ellipsoid to fusiform, 9–11 × 5–6 µm, halo 1 µmthick. Pycnidia not observed. Chemistry: an unknown spot with R fvalues 37, 9, 23 insolvents A, B’, C (Elix & Ernst-Russell 1993).
Notes:— Malmideaspecieswith a piperis- typeexciple are rare in the tropics but more abundant in subtropical regions or at higher elevations. On the other hand, species with a granifera- typeexciple are more common in the tropics or at lower elevation. Kalb et al.(2011)mention only one species ( Malmidea perplexaKalb) with a piperis- typeexciple for Thailand. Malmidea tratianais readily distinguished from that species by its dark brown hypothecium (hyaline in M. perplexa) and the black margin of the apothecia (whitish grey to dark brownish grey in M. perplexa). Malmidea tratianadiffers from the neotropical M. furfurosa(Tuck. ex Nyl.) Kalb & Lückingby the ± smooth thallus (granular to isidiose in M. furfurosa) and smaller ascospores (9–11 × 5–6 µmversus 11–14 × 5–7.5 µm). Furthermore, no secondary lichen products could be detected in M. furfurosaby means of TLC.
3128939316
2011-02-25
K, P, RAMK
Thailand
3
12.173612
Ban Nam Chieo
21
102.476944
Muang District
9
44
1
Trat
holotype