Phylloporia miomboensis Decock & Amalfi, 2025
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publication ID |
https://doi.org/10.3114/persoonia.2025.54.01 |
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DOI |
https://doi.org/10.5281/zenodo.16877505 |
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persistent identifier |
https://treatment.plazi.org/id/9C19878F-7057-FFEB-FF86-16C6FE10B562 |
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treatment provided by |
Felipe |
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scientific name |
Phylloporia miomboensis Decock & Amalfi |
| status |
sp. nov. |
Phylloporia miomboensis Decock & Amalfi , sp. nov. MycoBank MB 851910. Figs 4D–G View Fig , 6 View Fig .
Etymology: “ miomboensis ” (Latin) is referring to the phytochorion, the Miombo woodland.
Typus: Zimbabwe, Mashonaland West Province, in the vicinity of the Kariba Lake , ~ S17°08’23”, E27°50’30”, elev. ~ 480 masl, on the trunk of a small-stemmed living trunk, unidentified angiosperm, 10 Jan. 1989, L. Ryvarden, LR 25885 (holotype O F-306030) GoogleMaps .
Diagnosis: Phylloporia miomboensis is similar to P. memecyl i and P. warneckeicola by a combination of perennial, small basidiomes, projecting downward 10–20 mm, 8–30 mm long, 5–10 mm wide, attached by a narrow back point (vertex), mostly pendant, the pileus surface finely concentrically sulcate, but differs by the larger pores 8–9 pores / mm, 80– 120 µm diam., and growing on a bushy plant in the Zambezian / Miombo open forest.
Description: Basidiomata perennial, pileate, sessile (rarely with a stipe-like elongated base), mostly solitary or 2–3 imbricated; individual basidiomata attached by a small apical or subapical, dorsal vertex, turbinate, pendant when young, but very closely to the bark, hence appearing a first sight semicircular to broadly attached, projecting downward 10– 20 mm, conical flattened, enlarging toward the margin, then elliptical, elongated, crescent-shaped in outline at the margin, 8–30 mm long × 5–10 mm wide, in longitudinal section slightly triquetrous when very small, then thinly conical, with the pores surface concave (incurved inside), with a general hard corky consistency; pileus surface shortly velutinous, finely, densely concentrically sulcate, with numerous fine sulcations, up to 10–12 very narrow concentric zones/cm, sometimes radially furrowed, mainly brown (6E5, cocoa brown) to dark brown on aging (6F6, burnt amber), slightly lighter toward the margin (cinnamon brown); margin entire, thinly rounded, forming a well-defined narrow rim especially in young basidiomes or surrounding patchy regrowth of pore field, greyish yellow when fresh, pale cork-coloured on drying; pore surface (mostly) concave (incurved inside), light brown [cinnamon, 5E(4–5) to 5F5, bronze, sooty brown, Havana brown]; pores small, regular, mostly round, sometimes slightly ellipsoid, (7–)8–9 / mm, 80–120 µm diam. (av. = 98 µm diam.); dissepiments thin, 25–50 µm thick (av. = 34 µm); context almost absent to very thin, up to 0.5 mm thick at the base homogeneous, dense, compact, cinnamon brown to brown [6(D–E)6], topped by a hard, horny black line subtending an upper trichoderm; trichoderm 125–250 µm thick, shortly velutinous (under the lens), with agglutinated tufts of hyphae, dark brown (5D7) to yellowish brown (5E8); tube layer 0.5–1.5 mm deep, concolourous with the lower trama. Hyphal system dimitic; generative hyphae simple septate, thin- to slightly thick-walled, hyaline to faintly yellowish, scarcely branched, with a constriction at the branching point, 1.3–2.5 µm diam.; context dominated by skeletal hyphae, tightly packed parallel to long axis, arising from a generative hyphae and of limited growth, measured from 90 to 220 µm long (av. = 153 µm), 2.0–2.5 µm wide at the basal septa, progressively widening to (2.5–)3.2–4.0(–4.5) µm wide (av. = 3.4 µm), yellowish to yellowish brown, darker (brown) in alkali, thick- to very thick-walled with the lumen wide to narrow, mostly aseptate throughout, or with few secondary septa near the apices; trichoderm with mostly prostrate tufts of mostly unbranched hyphae, thick-walled with widely open lumen, septate with both true and secondary septa, the apices rounded to open, yellowish to brown, mostly 4–6 (–8) µm diam., the apices 6–8 µm wide; hymenophoral trama dominated by skeletal hyphae, descending, parallel to long axis, tightly packed, arising from a generative hyphae and of limited growth, measured from 100 to 220 µm long (av. = 153 µm), 2.0–2.5 µm wide at the basal septa, progressively widening to 2.8–3.3 µm wide (av. = 3.0 µm), yellowish to yellowish brown, darker (brown) in alkali, thick- to very thick-walled with the lumen wide to narrow, mostly aseptate throughout, or with few secondary septa near the apices, mostly straight in the main part, occasionally locally slightly inflated, or subapically constricted once or twice (slightly moniliform), slightly thick-walled at the basal septa, progressively thick-walled, ending thin-walled, aseptate throughout but with a few secondary septa near the apices, golden brown, darker brown in alkali. Hymenium: Basidioles slightly pyriform to broadly clavate, ~ 10 × 4.0 µm; mature basidia few, barrel-shaped to broadly clavate, ~ 10– 12 × 4.0–5.0 µm, with four sterigmata; cystidioles not seen; basidiospores ellipsoid to slightly oblong ellipsoid, appearing somewhat angular on drying, thick-walled, smooth, hyaline to pale yellowish in KOH, without reaction in Melzer’s reagent, 3.0–3.5 × 2.2–2.6 μm (av. = 3.3 × 2.4 µm), R = 1.2–1.5(– 1.6) (ave Q = 1.38).
Phylogenetic affinities: The species, hitherto, is related to P. minima ( Wu et al. 2021) , known from North-eastern Australia, P. cf. pectinata CBS 58.123, from India, and the form jasminii of P. ribis (or P. pectinatus var. jasmini, Quélet 1891 ) ( Bourdot & Galzin 1928) ( Fig. 1 View Fig ).
Ecology (substrate, host, habitat): Unidentified bushy plant, seasonally dry, Zambezian open forest (cf. Miombo woodland).
Geographic distribution: Currently known from a single spot of North-western Zimbabwe.
Notes: Phylloporia miomboensis is known from a single specimen, growing from an unidentified bushy angiosperm in Kariba Lake area, North-western Zimbabwe, without indication of the plant organ. The local vegetation is the seasonally dry Zambezian open forest and perhaps, more specifically, the Miombo woodland ( White 1983).
The gross morphology of P. miomboensis , including the small basidiome with narrowly concentrically sulcate pileus, a black line subtending a trichoderm, and small pores reminds much of P. warneckeicola and P. memecyli . These species also share their hyphal system, vegetative hyphae differentiation, and basidiospores shape and size. Phylloporia miomboensis differs in having slightly larger pores (8–9 pores / mm vs 10–11 and 11–13) and different autecological parameters, including the botanical host, the substrate (plant organ), and the habitat. The host of P. miomboensis is unknown. Nonetheless, it is not a species of Warneckea (host of P. warneckeicola ) or Memecylon (host of P. memecyli ), nor a Melastomataceae ; there is no representative of this family in the vegetation at the type locality of P. miomboensis . The habitat of P. warneckeicola and P. memecyli is the humid Lower Guinean rainforest, drastically different from the seasonally dry Zambezian open forest ( White 1983, Kindt et al. 2014, Marshall et al. 2021).
In a phylogenetic perspective, P. miomboensis is also distantly related from P. warneckeicola and P. memecyli ( Fig. 1 View Fig ) and has, hitherto, no known relative in tropical Africa. It is however related to the Australian P. minima , the mediterranean Ph. pectinatus var. jasmini , and an Indian specimen of P. cf. pectinata ( Fig. 1 View Fig ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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