Femsjonia uniseptata Shirouzu, 2017

Shirouzu, Takashi, Fukasawa, Yu & Nakamura, Yasuhide, 2017, Femsjonia uniseptata (Dacrymycetes, Basidiomycota), a new species collected from Pinus densiflora forests in Japan, Phytotaxa 312 (2), pp. 271-278 : 273-274

Femsjonia uniseptata Shirouzu , sp. nov. ( Figs. 2 , 3 )

MycoBank no.:—MB 820835

Diagnosis:—Differs from F. pezizoidea by having pulvinate, irregularly discoid to applanate basidiocarps; thin-walled internal and marginal hyphae; simple dikaryophyses; shorter probasidia; and 0–1-septate basidiospores.

Holotype:— JAPAN. Miyagi Pref.: Sendai, Aoba-yama , 15 November 2016, on a fallen tree of P. densiflora , coll. Y. Fukasawa, TNS-F-54019!, culture MAFF 246082 .

DNA sequences from the holotype:—LC222843 (LSU), LC222844 (ITS).

Etymology:—Refers to the one-septate basidiospores.

Description:— Basidiocarps scattered or gregarious, sometimes coalesced, pulvinate, irregularly discoid to applanate, with white hairs at the margins, sessile, yellow to orange, firm-gelatinous, 1–3 mm high, 2–8 mm diam., with a rooting base of ca. 1 × 0.5 mm. Internal hyphae branched, septate, thin-walled, hyaline, 4–5 μm diam., with clamp connections. Marginal hyphae on sterile surfaces of basidiocarps cylindrical, straight, or flexuous, septate, hyaline, with cylindrical thin-walled terminal cells of 20–50 × 3–4 μm. Hymenium limited to the ventral surface of the basidiocarp, amphigenous, composed of basidia and simple cylindrical dikaryophyses. Probasidia cylindrical to clavate, pale yellow, 30–40 × 4 μm, with basal clamp connections, becoming bifurcate. Basidiospores cylindrical, straight, or slightly curved, with an apiculum at the base, thin-walled, hyaline, 14–17 × 5–6 μm (16 × 5.5 μm on average, n = 10), length/width 2.5–3.2 (2.9 on average), 0–1-septate, germinated by germ tubes.

Distribution and habitat:— Japan, collected from fallen trees of P. densiflora .

Additional specimen examined:— JAPAN. Yamagata Pref.: Yamagata, Chitose-yama, 23 October 2014, on a fallen tree of P. densiflora , coll. Y. Fukasawa, TNS-F-54018!.

Figures

FIGURE 2. Basidiocarps of Femsjonia uniseptata on decaying wood of Pinus densiflora. A, B: TNS-F-54019 (holotype). C: TNS-F- 54018. D: TNS-F-54018 being eaten by a Diplomaragnidae species. Bars = 5 mm.

FIGURE 3. Femsjonia uniseptataTNS-F-54019 (holotype).A: Basidiocarps.B: Diagram showing a longitudinal section of the basidiocarp (dashed line: hymenium; dotted line: sterile marginal part). C: Basidiospores. D: Probasidium, developing basidia, and dikaryophyses. E: Marginal hyphae.