Pleonectria cucurbitula (Tode: Fr.) Hirooka, Rossman & P. Chaverri, comb. nov. MycoBank MB519710. Figs 103-105.
Basionym: Sphaeria cucurbitula Tode : Fr., Tode, Fungi Mecklenb. sel. 2: 38. 1791 : Fries, Syst. Mycol. 2: 415. 1823.
[equivalent to] Nectria cucurbitula (Tode : Fr.) Fr., Summa Veg. Scand. 2: 388. 1849.
[equivalent to] Scoleconectria cucurbitula (Tode : Fr.) C. Booth, Mycol. Pap. 73: 15. 1959.
= Nectria cylindrospora Sollm., Bot. Zeitung (Berlin) 22: 265. 1864.
[equivalent to] Ophionectria cylindrospora (Sollm.) Berl. & Voglino, Syll. Fung. Addit. 1-4: 217. 1886.
= Ophionectria scolecospora Bref. & Tav., in Brefeld, Unters. Gesamtgeb. Mykol. 10: 178. 1891.
[equivalent to] Scoleconectria scolecospora (Bref. & Tav.) Seaver, Mycologia 1: 198. 1909.
Anamorph: Zythiostroma pinastri (P. Karst.) Hohn. ex Weese, Mitt. Bot. Lab. Techn. Hochsch. Wien 8: 90. 1931.
[equivalent to] Zythia pinastri P. Karst., Rev. Mycol. (Toulouse) 7: 106. 1885.
Teleomorph on natural substrata: Ascomata and pycnidia sometimes formed on same or discrete stroma. Mycelium not visible around ascomata or on host. Stromata erumpent through epidermis, 1.0 mm high and 1.5 mm diam, orange to sienna, KOH+ dark purple, LA+ yellow, pseudoparenchymatous, cells forming textura angularis, intergrading with ascomatal wall. Ascomata superficial on well-developed stromata, scattered to aggregated in groups of 3-24, subglobose to globose, 242-333 [micro]m high x 281-370 [micro]m diam, red to umber, cupulate upon drying, sometimes with a depressed apical region, apical region slightly darker, KOH+ purple, LA+ yellow, surface usually bright yellow to yellowish green scurfy. Ascomatal surface cells forming textura globulosa or t. angularis sometimes including bright yellow scurf, 4-11 [micro]m diam, with pigmented, uniformly or irregularly, ca. 1.5 [micro]m thickened walls. Ascomatal wall 30-66 [micro]m thick, of two regions: outer region 22-47 [micro]m thick, intergrading with stroma, cells forming textura globulosa or t. angularis, walls pigmented, about 1.5 [micro]m thick; inner region 7-15 [micro]m thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Asci narrowly clavate, increasing in size as ascospores mature, 71-99 x 9-10 [micro]m, with inconspicuous ring at apex, 8-spored. Ascospores long-filiform, 15-39 septate, hyaline, (32.9-)43.2-64.8(-74.7) x (2.3-)2.7-3.5(-3.7) [micro]m (n = 100), smooth, budding to produce hyaline, thin-walled, tapering apex, slightly curved, bacillar ascoconidia, (1.9-)2.8-3.8(-4.5) x (0.8-)1.1-1.7(-2.1) [micro]m (n = 150), that fill asci.
Anamorph on natural substrata: Stromata erumpent through epidermis or developing with ascomata, orange to red. Pycnidia solitary or aggregated in groups of 3-17, superficial on stroma or rarely immersed at base, subglobose, smooth to slightly rough, cerebriform upon drying, 183-471 [micro]m, 133-544 [micro]m diam, red to bay, KOH+ slightly darker, LA+ slightly yellow. Pycnidial wall 21-43 [micro]m thick, of two regions: outer region 12-25 [micro]m thick, intergrading with stroma, cells forming textura globulosa, walls pigmented, about 1.0 [micro]m thick; inner region 8-15 [micro]m thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Conidiophores densely branched, generally with 1-3 branched, 18-34 [micro]m long, 1.2-2.5 [micro]m wide. Conidiogenous cells cylindrical to subulate, straight to slightly curved, enteroblastic, monophialidic, 6-11 x 0.5-1.5 [micro]m. Intercalary phialides generally observed, bearing (1-)3 terminal phialides, up to 6 [micro]m long, similar to short acropleurogenous conidiophores....