Etymology. Named after its subulate basidiocarps.
Basidiocarps scattered or gregarious, spathulate to subulate, sometimes slightly branched at apex, yellow-white to pale amber, sometimes with simple root, soft-cartilaginous, 2–6 mm high, 0.5–1 mm diam. Sterile parts of basidiocarps covered with solitary or fasciculate, cylindrical to clavate, simple or branched, straight or flexuous, septate, thin- or thick-walled, sub-hyaline marginal hypha, 15–25 × 3.5–6 μm. Internal hyphae branched, thin-walled, septate, hyaline, 2–4 μm diam, with clamp connections. Hymenium unilateral, sometimes amphigenous. Probasidia cylindrical to clavate, hyaline, 15–34 × 3.5–8 μm, with a basal clamp connection, becoming bifurcate. Basidiospores subglobose to reniform, with an apiculum at the base, thin-walled, hyaline, 10–16 × 4.5–8.5 μm (av. 12.5 × 6 μm; n = 20), 0–1-septate, germination via germ tubes.
Culture characteristics — Colonies attaining about 6 mm diam, wet, yellow to orange. Conidiogenesis not observed.
Specimens examined. japan, Kyoto, Mt Daimonji, on dead branches of an unknown conifer, 30 June 2006, T. Shirouzu, holotype TNS-F-21046 (HNo.356), culture ex-type MAFF241173; Mt Kiyomizu, on dead branches of Pinus densiflora, 7 Oct. 2006, T. Shirouzu, TNS-F-21066 (HNo.534); Nara, Mt Tamaki, on dead branches of P. densiflora, 7 July 2006, T. Shirouzu, TNS-F-21059 (HNo.430); Wakayama, Mt Nachi, on dead branches of Cryptomeria japonica, 6 July 2006, T. Shirouzu, TNS-F-21047 (HNo.364); 11 Oct. 2006, T. Shirouzu, TNS-F-21068 (HNo.552).
Notes — Dacryopinax sphenocarpa is characterised by sharp, spathulate basidiocarps, hyphae with clamp connections, solitary or fasciculate, thin- or thick-walled marginal hypha, and thin-walled, 0–1-septate basidiospores. This dacrymycetous fungus belongs to the genus Dacryopinax because of its basidiocarp morphology, having a unilateral hymenium and fasciculate, thick-walled marginal hypha. Only D. taibaishanensis is known as a species having hyphae with clamp connections in this genus (Liu & Fan 1990). Dacryopinax sphenocarpa is different from D. taibaishanensis in the shape of basidiocarps (D. taibaishanensis is discoid) and in the size (20–35 × 7–10 μm) and septal number (5–7-septate) of basidiospores. In molecular phylogenetic analyses, this species did not cluster in a monophyletic clade with another species of Dacryopinax, D. spathularia, but represented a monophyletic group with Dacrymyces ancyleus (Fig. 16).