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Once Again on Discosphaerina Karstenia 39:59-63, 1999 Once again on Discosphaerina LENNART HOLM, KERSTIN HOLM and MARGARET E. BARR HOLM, L., HOLM, K. & BARR, M.E. 1999: Once again on Discosphaerina.- Karste­ nia 39: 59-63. Helsinki. ISSN 0453-3402 Discosphaerina Hohn. is reinstated as a valid generic name, typified by D. discophora Hohn., for some small, amerosporous, unitunicate Ascomycetes that fit best within the family Hyponectriaceae. The new combinations D. niesslii (Kunze ex Rehm) L. Holm, K. Holm & M.E. Barr, and D. lonicerae (Dearn. & Barthol.) L. Holm, K. Holm & M.E. Barr are made, and the new species D. sorbi L. Holm, K. Holm & M.E. Barr is described. Guignardia Viala & Ravaz, nom. cons., is accepted for similar small, am­ erosporous but bitunicate Ascomycetes in the Dothideaceae. Key words: Ascomycetes, Hyponectriaceae, Dothideaceae, taxonomy, morphology Lennart Holm & Kerstin Holm, Botanical Museum, Uppsala University, No rbyvdgen 16, SE-752 36 Uppsala, Sweden Margaret E. Barr, 9475 inverness Road, Sidney, British Columbia, Canada V8L 5GB Introduction Within the past few years, we have been puzzled Arwidssonia B. Erikss. is similar by habit in by several amerosporous ascomycetes that lack leaves and by the collabent lenticular ascomata a defined ostiole and periphyses, and open irreg­ that open by three to five lobes. Arwidssonia ularly between cells in the upper region of as­ empetri (Rehm) B. Erikss. is a phragmosporous comata. The small ascomata are sphaeroid, often taxon. The hymenium does exhibit paraphyses, collabent on drying, and are visible as dark sunk­ and the ascus apices are amyloid after pretreat­ en dots in the affected tissues. The thin-walled ment. Eriksson (1974) did not indicate familial apical cells are usually encircled by one or two position of the genus. Barr (1976) assigned it rows of dark-walled pseudoparenchymatous to the Physosporellaceae, i.e. Hyponectriaceae, cells that continue as the lateral and basal perid­ and it has remained there ever since (e.g., Hawks­ ium. A shallow clypeus of textura epidermoidea worth et al. 1995, Eriksson & Hawksworth 1998). may extend from the upper surface. The hy­ The taxa in question also share many features menium lacks paraphyses, or occasionally a few with H)ponectria Sacc., where periphysate osti­ are seen compressed between asci; the asci arise oles are formed. In that genus, H. buxi (Alb. & from a wide basal subhymeniallayer, and have a Schwein. : Fr.) Sacc. has nonamyloid ascus api­ somewhat thickened wall that lacks an ocular ces, although most other species presently in­ chamber or obvious apical ring. The asci have cluded (Barr 1977) have amyloid apices. The not been observed to open in a fissitunicate amyloid reaction appears to be variable within fashion. A critical observation made recently is genera or among species of a genus and does not that following alkaline pretreatment (Kohn & constitute a good family characteristic. Korf 1975) a low or well developed, amyloid api­ cal ring is seen to be present. 60 L. HOLM, K. HOLM & BARR: DISCOSPHAERINA KARSTENIA 39 (1999) The taxonomic problem ponectriaceae points to a close relationship with Arwidssonia on the one hand, and Hyponectria To determine a possible genus, we in estigated on the other. We propose the following synony­ the past disposition of some of the species in­ my and include the names of a few other species, volved. Discosphaerina Hahn. was assigned to as well as an undescribed species, that belong in synonymy under Guignardia Viala & Ravaz by the genus. Arx and Muller (1954). Several of the species that they illustrated have strongly sphaeroid, nonos­ Discosphaerina Hahn., Sitzungsber. Kaiser!. tiolate ascomata; Arx and Muller indicated that Akad. Wiss., Nat.-Math. Kl. 126: 353. 1917. the asci were bitunicate. Discosphaerina is typi­ Type species: D. discophora Hahn., Fig. 6. fied by D. discophora Hahn., on leaves of Solid­ syn. Guignardia steppani Petr. On leaves and ago. Hahne! (1917) observed that it differed from stems of Solidago. Guignardia by the plane, nonostiolate apical re­ = Laestadiella Hahn., Ann. Mycol. 16: 50. gion of shallow ascomata and absence of para­ 1918, nom. nud. Sole species: L. niesslii physes. He described thin-walled asci. Petrak (Kunze ex Rehm) Htihn. = Discosphaerina (1920) described Guignardia steppani on the niesslii (Kunze ex Rehm) L. Holm, K. Holm & same host plant, and in 1921 reduced it to synon­ M.E. Barr, comb. nov. Basionym: Laestadia ymy under D. discophora. This is one of the niesslii Kunze, Fungi sel. exs. 241 , nom. nud.; group of taxa that we have examined recently. ex Rehm, Hedwigia 20: 53. 1881. On leaves of Petrak (1924) emended the description of Dis­ Populus and Salix spp. cosphaerina to include several other species with additional stromatic tissues connecting as­ Additional species: comata. He assigned Laestadia niesslii Kunze to Discosphaerina epilobii (Wallr.) Petr. On Physalospora Niess! because of the occasional stems of Epilobium spp. presence of paraphyses among asci. This taxon Discosphaerina lonicerae (Dearn. & Bar­ is another one that provided the stimulus for the tho!.) L. Holm, K. Holm & M.E. Barr, comb. present investigation. It is the sole species of nov. Basionym: Guignardia lonicerae Dearn. Laestadiella Hahn., the genus name itself a no­ & Barthol. Mycologia 18: 245. 1926 (Barr 1977 men nudum. The species forms sphaeroid, non­ under Hyponectria). On leaves of Loni-cera ostiolate ascomata with abundant hyphae con­ spp. necting ascomata; the asci are thin walled, are Discosphaerina punctoidea (Cooke) Petr. On not bitunicate, and have an amyloid apical ring leaves of Quercus spp. after KOH- pretreatment. Klebahn (1918) provid­ Discosphaerina sorbi, L. Holm, K. Holm & ed a detailed description and illustrations of the M.E. Barr, sp. nov. -Figs. 1-5. fungus as Guignardia. He emphasized the flat­ Species nova margine distincto perithecio­ tened upper region of the ascoma that gives a rum imprimis insignis. turbinate shape to the structure in section, and Holotype: Sweden. Jamtland. Are parish: Ena­ that opens rather widely at maturity. He also not­ fors , c. 500 m SE of the railway station, in mixed ed that asci develop from a wide basal layer, rath­ forest along the road to Handa!, 12.6.1998 (ma­ er than in a fascicle from a restricted subhy­ tured at "Jerusalem" until15.7.1998) K. & L. menium, have a scarcely thickened wall, and lack Holm 6170 (UPS). paraphyses. His cultures yielded conidia in age Ascomata epiphyllous, subcuticular, gregari­ from short contorted hyphae, interpreted by ous, often two or three confluent, generally 0.1- Sivanesan (1984) as belonging to Aureobasidi­ 0.2 mm diam., including a distinct margin, up to 40 um. Klebahn's attempted infection of living J..Lm broad, first very broadly conical, later col­ plants failed. lapsing. Peridium mostly 10-15 J..Lm broad (later­ ally more), of 2-3 layers of cells (laterally more); Unitunicate Discosphaerina the upper part composed of somewhat radially We believe the evidence is convincing that Dis­ arranged cells up to 15 J..Lm long, basally the cells cosphaerina is indeed an unitunicate taxon, and smaller and more angular; laterally the peridium is that the genus should be utilized for this particu­ made up of larger cells, up to 20 J..Lm and passing lar group of species. Their disposition in the Hy- into a clypeal margin of textura epidermoidea KARSTENIA 39 (1999) L. HOLM, K. HOLM & BARR: DISCOSPHAERINA 61 Figs. l-5: Discosphaerina sorbi. 1. Ascomata on leaf of Sorbus aucuparia (Holm & Holm 6170). Bar= 1 mm. 2. Ditto, clypeus visible at arrows. Bar= 0.2 mm. 3. Part of crushed ascoma, clypeus seen from above (6170). Bar= 20 f.lffi . 4. Ascoma in section, with lateral clypeus (4096) . Bar= 20 f.lill. 5. Asci with apical annulus J+ after KOH­ pretreatment (4087a). Bar = 20 f.1m. Fig. 6: D. discophora. Asci with apical annulus J+ after KOH-pretreatment (Petr., Fl. Bohem. Mor. exs. II: 1 no 1232 sub nom. Guignardia steppani). Bar= 20 f.lill. 62 L. HOLM, K. HOLM & BARR: DISCOSPHAERINA KARSTENIA 39 (1999) composed of one layer of elongated, often lobed of numerous collections within the genus cells, up to 40 Jlm. Paraphyses none. Asci gener­ showed no pseudoparaphyses present at maturi­ ally 55-60 x 5-6 Jlm, cylindric-clavate, 8-spored, ty, but only interthecial cells that become com­ with a small apical annulus, J+ after KOH­ pressed between and above the developing asci. pretreatment. Ascospores nonseptate, hyaline, Aa (1973) had a similar view of the locule in Guig­ about ellipsoid, somewhat unequally flattened, nardia. Janex-Favre et al. (1996) argued that such 9-13 x 3.5-5 11m. In last year's fallen leaves of structures did develop, coexisting with carpo­ Sorbus aucuparia L. centra1 cells, and that Guignardia should be as­ Additional material seen: Harjedalen. Hede signed to the Botryosphaeriaceae. Recent classi­ parish: Nysater, c. 180m S of the inn "Orren," fications, such as Eriksson (1992), Hawksworth regia subalp., c. 870 m, 7.6.1998 K. & L. Holm et al. (1995), Eriksson and Hawksworth (1998), 6148 (UPS). Jamtland. Are parish: Storlien, have Guignardia in the Mycosphaerellaceae, swampy ground of Fjallien, regia subalp., Botryosphaeria in the Botryosphaeriaceae, i.e., 26.5.19841. Sperber (DAOM, UPS). Oviken par­ with interthecial cells in Guignardia, pseudopa­ ish: Persasen, c. 500 m NNE of the hotel "Bla lam­ raphyses in Botryosphaeria. The Dothideaceae, pan" 13.6.1998 K. & L. Holm 6171 (UPS). Tome including Mycosphaerellaceae, for taxa having Lappmark. Jukkasjarvi parish: Mt Nuolja, near uni- or multiloculate ascomata, would seem to be the lift station, regia subalp., 4.7.1986 K. & L. suitable to house Guignardia. Holm 4087a, 4096 (UPS). Guignardia Viala & Ravaz, nom. cons., Bull. It is noteworthy that this conspicuous fungus Soc. Mycol. France 8: 63. 1892. Type species: so far has been found only in the subalpine and G.
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