Helotiales » Heterosphaeriaceae » Heterosphaeria

Heterosphaeria linariae

Heterosphaeria linariae (Rabenh.) Rehm, Rabenh. Krypt.-Fl., Edn 2 1.3(lief. 30): 203 (1888) [1896]

= Heterosphaeria ovispora Leuchtm., Mycotaxon 28(2): 272 (1987)

= Heteropatella lacera Fuckel, Jb. nassau. Ver. Naturk. 27-28: 54 (1874) [1873-74]

Saprobic on dead stems of Euphorbia sp. and Linaria vulgaris. Sexual morph: see Leuchtmann (1987) and Ekanayaka et al. (2019). Asexual morph: Conidiomata 150–420 µm diam., 300–400 µm high, pycnidial, globose to subglobose or irregular in outline, semi-immersed to superficial, separate to gregarious or confluent, unilocular, glabrous, thick-walled, ostiolate, rugose. Ostiole 70–210 µm long, 80–150 µm wide, cylindrical or funnelled, single, centrally or excentricity located. Conidiomatal wall 10–70 µm wide, composed of dark brown, thick-walled cells of textura angularis to textura globosa. Conidiophores up to 70 µm long, hyaline, branched, septate, formed from the innermost layer of wall cells. Conidiogenous cells 8–25 × 2–3 µm, hyaline, enteroblastic, phialidic, cylindrical, smooth, with a slightly wider apex, proliferating, sympodially 2–4 times. Conidia 44–68 × 2–4 µm ( = 53 × 3 µm; n = 50), hyaline, fusiform, mostly 4-septate, occasionally 3-septate, slightly constricted at septa, guttulate, smooth-walled, bearing appendages, basal cell 2.4–10 µm ( = 7 µm), obconic with a truncate base, median cells with a total length 9–25.6 µm ( = 15), mostly 3, occasionally 2 or 4, cylindrical to doliiform, apical cell narrow conical and attenuated into an unbranched, cellular appendage 25–44 × 1–2 µm ( = 36 × 1.5 µm; n = 30), basal appendage 5–25 × 1–2 µm ( = 12 × 1.5 µm; n = 30), filiform, unbranched, attenuated, excentric.

 

Material examined: Austria, Nassau, Dombachsgraben, on dead stem of Linaria vulgaris Hill (Plantaginaceae) (FH 01142398, Fuckel -Fungi Rhenani Edn. I, #2565, isotype); Italy, Province of Forlì-Cesena, Bagno di Romagna, Alfero, on dead aerial stems of Silene sp. (Caryophyllaceae), 6 April 2016, Nello Camporesi, IT2922 (MFLU 16-1154, reference specimen designated here), (KUN, HKAS 97463); ibid., Province of Arezzo, Pieve Santo Stefano, Montalone, on dead aerial stems of Euphorbia sp. (Euphorbiaceae), 2 May 2014, Erio Camporesi, IT1847 (MFLU 19-2866).

 

Notes: The sequences of our collection were obtained by direct sequencing. The LSU sequence of (MFLU 19-2866/IT1847) and (MFLU 16–1154/IT2922) is 99% or 100% similar to H. linariae (CBS 163.27, MFLU 15-2764, CBS 636.86, KP 2019a). There are four base pairs difference between the ITS (including 2 gaps) and rpb2 sequence of (MFLU 16–1154/IT2922) and H. linariae (CBS 163.27). The description of (MFLU 16–1154/IT IT2922) and (MFLU 19-2866/IT1847) is in accordance with the asexual morph of H. linariae. The dimensions of these two collections are in the range of the asexual morph of H. linariae [(43–64 × (2.5–)3–4 ( = 53.5 × 3.5 µm)] (Nag Raj 1993), and 42–78.5 × 2.6–4 ( = 55.6 × 3.2 µm).

 

Heterosphaeria linariae (asexual morph, FH 01142398, isotype) a, b Herbarium specimen. c, d Appearance of black conidiomata on the host surface. e–f, h Vertical sections of conidiomata. g Section of peridium. i–l Conidiophores, conidiogenous cells and developing conidia. m–p Conidia. Scale bars c–f = 200 µm, g–h = 50 µm, i = 20 µm, j–p = 10 µm.

 

Heterosphaeria linariae (asexual morph, MFLU 16-1154, reference specimen). a Herbarium specimen. b, c Appearance of black conidiomata on the host. d, g Section of peridium. e Vertical section of conidiomata. f Ostiole. h–k Conidiophores, conidiogenous cells and developing conidia. l–p Conidia. Scale bars a, e = 100 µm, b = 500 µm, c = 200 µm, d, f = 50 µm, g = 20 µm, h = 5 µm, i–p = 10 µm.

 

 

References:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

 

 

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