Steinera latispora (Øvstedal) Ertz 2017

Ertz, Damien, Poulsen, Roar S., Charrier, Maryvonne & Søchting, Ulrik, 2017, Taxonomy and phylogeny of the genus Steinera (Arctomiales, Arctomiaceae) in the subantarctic islands of Crozet and Kerguelen, Phytotaxa 324 (3), pp. 201-238 : 212-213

publication ID	https://doi.org/ 10.11646/phytotaxa.324.3.1
persistent identifier	https://treatment.plazi.org/id/F336CC7E-5D7F-0220-AEB4-A7DEFE8EFEB6
treatment provided by	Felipe
scientific name	Steinera latispora (Øvstedal) Ertz
status	comb. nov.

Treatment

Steinera latispora (Øvstedal) Ertz View in CoL comb. nov. ( Fig. 5 View FIGURE 5 )

MycoBank: MB 822679 Basionym: Arctomia latispora Øvstedal , in Øvstedal & Gremmen, South African Journal of Botany 72: 354 (2006). Type:— HEARD

ISLAND. Scarlet Hill Plateau, 27 January 2001, N.J.M. Gremmen H-0904 (holotype HO!). [Note: published as ‘“ Arctomia ”

latispora ’.]

Description: see Øvstedal & Gremmen (2006).

Distribution and ecology: This species is only known from Heard Island ( Øvstedal & Gremmen 2006) and Crozet (this paper). On Crozet, the species seems to be rare and was only found in one locality on saxicolous/terricolous mosses on boulders near a small stream. It must be searched for on Kerguelen.

Notes: Steinera latispora is similar to S. isidiata and mainly differs from it by a non-isidiate thallus (see notes under that species for more details). Specimens from Crozet are mainly sterile, not allowing us to improve the description made by Øvstedal & Gremmen (2006). We observed only two ascospores of 27–28 × 8–10 μm, thus larger than in the original description. According to Øvstedal & Gremmen (2001), Arctomia delicatula and A. interfixa “have less developed thalli with cortex only one layer thick and convex apothecia with excipulum proprium consisting of radiating hyphae ( Henssen 1969)” but they have similar ascus type, spores and paraphyses as “ A.” subantarctica . Both “ A.” subantarctica and “ A.” latispora were said to belong to a different genus than Arctomia s. str., for which the generic affinity was under study ( Øvstedal & Gremmen 2006). Our phylogeny proves that they belong to Steinera .

Examined specimens: CROZET. Île de La Possession, vallon du barrage situé entre la Base Alfred Faure et la Pointe du Bougainville, c. 170 m, 46°26’32”S, 51°50’56”E, 21 November 2015, D. Ertz 20591 ( BR) GoogleMaps ; ibidem, c. 165 m, 46°26’22.5”S, 51°50’58”E, 21 November 2015, D. Ertz 20577 ( BR) GoogleMaps ; ibidem, 11 November 2016, D. Ertz 20966, 20969 ( BR) .