Nectria pseudadelphica Rehm, Hedwigia 31: 303. 1892. Figs 62, 63.
[equivalent to] Cucurbitaria pseudadelphica (Rehm) Kuntze, Revis. gen. pl. (Leipzig) 3: 461. 1898.
Anamorph: unknown.
Teleomorph on natural substrata: Mycelium not visible around ascomata and on host. Stromata erumpent through epidermis, up to 1.5 mm high and 2.0 mm diam, dark scarlet, KOH+ blood colour, LA+ yellow, pseudoparenchymatous, cells forming textura angularis, intergrading with ascomatal wall. Ascomata superficial on well-developed stromata, aggregated in groups of 3-15, subglobose to globose, 270-390 [micro]m high x 250-390 [micro]m diam, scarlet to sienna, not cupulate upon drying, apical region slightly darker, KOH+ dark red, LA+ yellow, smooth to roughened. Ascomatal surface cells forming textura globulosa or t. angularis, 5-14 [micro]m diam, with pigmented, uniformly ca. 1.5 [micro]m thickened walls. Ascomatal wall 50-70 [micro]m thick, of three regions: outer region 30-45 [micro]m thick, intergrading with stroma, cells forming textura globulosa or t. angularis, walls pigmented, about 1.5 [micro]m thick; middle region ca. 7-18 [micro]m thick, cells forming textura globulosa containing brown to red-brown pigment droplets; inner region 10-15 [micro]m thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Asci clavate, 90-140 x 7-15 [micro]m, with inconspicuous ring at apex, 8-spored, ascospores biseriate. Ascospores fusiform to allantoid, straight to curved, (25.1-)26.8-31.4(-36.7) x (7.5-) 8.7-11.1(-13.2) [micro]m (n = 60), (0-)1(-3)-septate, hyaline, smooth to weakly spinulose.
Habitat: On dead branches.
Distribution: South America (Ecuador).
Lectotype of Nectria pseudadelphica designated herein: Ecuador, Pichincha, Cotocollas, on wood, 24 Feb. 1892, N.G. Lagerheim, Lectotype NY 01013167, Isolectotypes NY 01013168, S F10211, S F10213.
Additional specimens and isolates examined: Ecuador, Chimborazo, alt. 3500 m, on dead of twig, 26 Jan. 1994, J.N. Hedger ex IMI 361831, BPI 737865, BPI 802791.
Notes: Nectria pseudadelphica is a difficult species to identify within the genus Nectria because its anamorph has not been observed nor does a living culture exist to determine its phylogenetic position. Further, this species is similar to species of Neonectria in having firmly attached ascomata in natural substrata that do not become cupulate upon drying (Fig. 62A, B). This species is included in Nectria for two reasons. First, up to three septate ascospores as occurring in N. pseudadelphica have never been observed in species of Neonectria (Figs 62G, 63C). Second, the middle region of the ascomatal wall includes dark brown pigment droplets as observed only in species of Nectria such as N. lateritia, N. pseudocinnabarina, and N. pseudotrichia (Figs 62D, 63A). For these reasons, this species is retained in the genus Nectria. Nectria pseudadelphica may produce a synnematous anamoph because all species of Nectria having an ascomatal wall of three regions also produce a synnematous anamorph, thus one suspects that N. pseudadelphica will have a similar anamorph.
In this study, we designate the lectotype of N. pseudadelphica as NY 01013167, and the other specimens of this collection are isolectotypes.
Nectria pseudocinnabarina Rossman, Mem. New York Bot. Gard. 49: 260. 1989. Figs 64-66.
Anamorph: tubercularia lateritia-like.
Teleomorph on natural substrata: Mycelium not visible around ascomata and on host. Stromata erumpent through epidermis, up...