Diaporthe rauvolfiae
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Ordo: Diaporthales
Familia: Diaporthaceae
Genus: Diaporthe
Name
Diaporthe rauvolfiae Y. Marín, C. Lamb., Kouam & L. Schweizer sp. nov. – Wikispecies link – Pensoft Profile
Etymology
Name refers to the host genus that this fungus was isolated from, Rauvolfia.
Description
Conidiomata pycnidial in culture on PNA, globose or irregular, dark brown to black, solitary or in groups, embedded, erumpent, 210–450(–530) μm diam, white to cream conidial drops exuded from ostioles; conidiomatal wall yellowish brown to olivaceous brown or brown, composed of 1–2 layers, textura angularis. Conidiophores cylindrical to subcylindrical, tapering towards apex, base subhyaline to pale yellow or pale olivaceous, apex hyaline to subhyaline, densely aggregated, smooth-walled, (0–)1–2 septate, 9–19.5 × 1.5–3.5 μm. Conidiogenous cells phialidic, cylindrical to subcylindrical, tapering towards apex, hyaline, mostly terminal, 6.5–13.5 × 1.5–3 μm. Paraphyses not observed. Alpha conidia broadly fusiform to obovoid, hyaline, apex rounded or acute, base acutate, biguttulate to multiguttulate, aseptate, 6.5–9 × 2–3 μm. Beta conidia filiform, curved, tapering towards apex, hyaline, not guttulate, aseptate, 20–36.5 × 1–2 μm. Gamma conidia less frequent, fusiform to obovoid, straight to slightly curved, rarely sinuose, acutate ends or one acutate and other round, hyaline, multiguttulate, aseptate, (8–)9–13 × 1.5–2.5 μm.
Culture characters
Colonies on PDA reaching 72–76 mm in 2 weeks, grayed yellow (160B–C) with white ring and transparent margins, cottony to slightly feathery, raised, lobate, margins filamentous; reverse grayed yellow (160B–C) with white ring and transparent margins. Colonies on MEA covering the surface of the Petri dish in 2 weeks, white to grayed white (156B), cottony to slightly feathery, raised, margins filamentous; reverse grayed green (197A) to gray brown (199A) with black (202A) center. Colonies on OA covering the surface of the Petri dish in 2 weeks, grayed white (156B–D), cottony to slightly feathery, raised, margins filamentous; reverse gray brown (199A).
Specimen examined
Cameroon, Tonga, West Region, from Rauvolfia vomitoria, 19 Jun. 2019, E.G.M. Anoumedem (holotype CBS H-24924, culture ex-type CBS 148912 = STMA 18287).
Notes
Diaporthe rauvolfiae was located in an independent branch far from other species of Diaporthe (Fig. 3). This species is characterized by the production of alpha, beta and gamma conidia, which were not observed in other species reported from Cameroon except of D. isoberliniae. This latter species differs from D. rauvolfiae in the length of the conidiophores (13–42 μm in D. isoberliniae vs 9–19.5 μm in D. rauvolfiae), beta conidia (11.5–27.5 μm in D. isoberliniae vs 20–36.5 μm in D. rauvolfiae) and gamma conidia (10–18.5(–21) μm in D. isoberliniae vs (8–)9–13 μm in D. rauvolfiae). Both species are not phylogenetically related (Fig. 3).
Original Description
- Lambert, C; Schweizer, L; Matio Kemkuignou, B; Anoumedem, E; Kouam, S; Marin-Felix, Y; 2023: Four new endophytic species of Diaporthe (Diaporthaceae, Diaporthales) isolated from Cameroon MycoKeys, 99: 319-362. doi
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