Claviradulomyces schini L.L.Duarte, D.M.Macedo & R.W.Barreto, 2021

Duarte, Lidiane Leal, M, Davi, Macedo, esquita de & Barreto, Robert Weingart, 2021, Cryptic but ubiquitous: Claviradulomyceae fam. nov. with five novel species of the lenticel fungus Claviradulomyces from Brazil, Cryptogamie, Mycologie 20 (7), pp. 121-135 : 129-130

Claviradulomyces schini L.L.Duarte, D.M.Macedo & R.W.Barreto , sp. nov.

( Fig. 4 )

MYCOBANK NUMBER. — MB 811918.

HOLOTYPE. — Brazil. State of Minas Gerais, Viçosa, on branches of Schinus terebinthifolius Raddi ( Anacardiaceae ), 12.XII.2013, R. W.Barreto ( VIC 42845; ex-type culture COAD 1937; GenBank LSU sequence KP 975456).

ADDITIONAL SPECIMENS EXAMINED. — Brazil. State of Minas Gerais, Viçosa, on branches of S. terebinthifolius , 22. VI.2013, R. W.Barreto ( VIC 42842).

ETYMOLOGY. — Referring to its host-genus Schinus .

DIAGNOSIS. — Similar to C. xylopiae but producing pycnidia with vermiform (narrow, long and sinuose) ostiole necks. HABITAT AND DISTRIBUTION. — Inside lenticels on branches of S. terebinthifolius (Brazilian pepper tree) in secondary forest or ruderal situations.

DESCRIPTION

Asexual morph on living, often defoliated branches bearing abnormal hypertrophied spongy lenticels. Conidiomata pycnidial, semi-immersed, mostly isolate, globose, 55-125 Μm diam, walls subhyaline to yellowish, textura intrincata at the base, changing into light brown textura globulosa in the upper half, ostiolate, rostrate: neck, long, sinuous, vermiform, 245-385 × 32 Μm, dark brown, textura porrecta becoming subhyaline towards the tip, smooth. Conidiophores commonly reduced to conidiogenous cells, lageniform, straight to slightly curved, 4.5-6 × 1.5-2 Μm, 0-1 septate, hyaline, smooth. Conidia straight to slightly curved, fusoid-filiform to narrowly acerose, 18-31 × 1-2.5 Μm, attenuated toward the ends, apices acute to subacute, aseptate, guttulate, hyaline, smooth. Sexual morph not observed.

Culture characteristics

Slow growing (5.5 cm diam after 40 days), colonies flat, adpressed on the medium (in the dark) or raised and moist (under alternating light), aerial mycelium velvety, dense becoming scarce towards periphery, uniformly olivaceous – black or greenish black with narrow dull green peripheral ring; spermogonia (formed on PCA), subsphaerical, 62.5-115 × 47.5-87.5 Μm, spermatia in white creamy masses, globose to subglobose, 2-3 × 2-2.5 Μm, hyaline, smooth. No conidia or ascospores produced in any medium.

NOTES

Claviradulomyces schini sp. nov. is similar to C. tabebuiae sp. nov. but can be differentiated from that species by having shorter conidia, 18-31 Μm as compared to 32-40 Μm of C. tabebuiae sp. nov., and by having its conidiophores reduced to lageniform conidiogenous cells.

Figures

FIG. 4. — Claviradulomyces schini sp.nov.(VIC 42845,holotype):A. Schinus terebinthifolia Raddi.Individual branch with dieback symptom and abnormal lenticels colonized by C. schini; B, close-up of hypertrophyed lenticels; C, conidiophores with immature conidia still attached; D, conidia; E, pycnidium with sinuose and rostrate-vermiform ostiole neck. Scale bars: B, C, 10 µm; E, 30 µm.