Six species of the lichen genus Strigula are reported from New Zealand: S. delicata Sdrus. sp. nov. S. fossulicola P. M. McCarthy et al., S. nemathora Mont., S. novae-zelandiae (Nag Raj) Sirus. comb. nov. (Basionym: Discosiella novae-zelandiae Nag Raj), S. oceanica P. M. McCarthy et al., and S. subtilissima (Fde) Mill. Arg. In 1983, the late J. K. Bartlett deposited a large set of foliicolous lichens he had collected in New Zealand in the LG herbarium. Although poorly curated, the material was prolific and has yielded several new taxa: the type collection of Enterographa bartlettii S6rus. (1984), Badimiella serusiauxii Malcolm & V6zda a monotypic genus with spectacular campylidia (Malcolm & V6zda 1994; S6rusiaux 1986), and the recently described Strigula kaitokensis S6rus. & Polly (1996). For some time, I was aware that several other undescribed species of Strigula, not mentioned in the monograph of Santesson (1952), were present in the material. Two have now been described by McCarthy et al. (1996) from Lord Howe Island (Australia) and are here recorded for the first time from New Zealand; another species appeared to be identical with the anamorphic lichenized fungus Discosiella novae-zelandiae Nag Raj (1981) and is here transferred to Strigula, and an additional one is here described as new. A new species of Mycomicrothelia, amazingly similar to a genuine Strigula, has also been found in the collections and is described as new in a separate paper (Sdrusiaux & Aptroot 1998). New Zealand appears to be rich in species of Strigula, with several new species and new records reported (Hafellner & Kalb 1995; Harris 1995; McCarthy 1995; McCarthy & Malcolm 1996; S6rusiaux & Polly 1996). However, the genus is still poorly known at the world level so it is too early to claim that New Zealand is a center of diversity. More work is needed before a global assessment can be made. The taxonomic concept of the genus Strigula has been reorganized by Harris (1975, 1995) to include all foliicolous species referred by Santesson (1952) to that genus, Raciborskiella Hohnel, the so-called Porina phyllogena group (= Phylloporis Clem.), and several corticolous and saxicolous species, previously included in Arthopyrenia Massal. and Porina Mtill. Arg. All these species have the same type of asci, paraphyses, and conidia. This concept is accepted here as such a genus is clearly monophyletic, even if one expects that further detailed studies may lead to the segregation of several smaller genera within that clade. All collections mentioned in this paper have been gathered by the late J. K. Bartlett (t1986) and are housed in LG. Representative samples are deposited in B, CANB, CHR, and herb. R. Luicking. STRIGULA DELICATA Sdrusiaux sp. nov. (FIG. 1-2 & 7, a-b) Thallus epiphyllus, subcuticularis, plus minusve circularis, 2-5 mm diam., pallide viridis vel olivaceo-brunneus, nitidus, laevigatus, lobis angustis (ca 0.1 mm latis) et dichotomis formatus, interdum connatis et reticulum formantibus; margo cum continua vel interrupta, nigra linea et numerosis, parvulis, elongatis nigrisque papillis. Algae ad Cephaleuros pertinentes. Perithecia in parvis, circularibus thalli maculis crescentia, ad marginem locatis, hemisphaerica, 0.2-0.25 mm diam. et 0.10-0.18 mm alta, nigra et nitida; paraphyses numerosae, ramosae et leviter anastomosantes; asci clavati, 55-60 x 10-14 pCm; ascosporae 8/ascus, biseriatae, ellipsoideae ad fusiformes, 1-septatae, 15-16(-18) x 4.5-5.0 pm, pariete crasso (0.7-1.0 pEm). Macroconidia oblonga, 1-septata, appendicibus mucosis, 3-5 Ipm longis et terminalibus praedita, 13-16 X 3.0-3.5 Ipm; microconidia ellipsoidea, ca 3 X 1 im. Thallus epiphyllous, subcuticular, occurring or not along the nerves, margins, and scars of leaves, ? circular, 2-5 mm in diam., usually quite abundant, pale green or olive brown (white when dead), shiny but without any metallic tint, with smooth surface, formed of dichotomously branched, narrow (ca 0.1 mm wide) lobes that can fuse laterally and form a reticulum; lobes margins with discontinuous or continuous black line and usually with numerous, rather regularly scattered, small, elongate, black papillae. Photobiont a species of Cephaleuros (Trentepohliaceae), with ? rectangular or rounded cells, 8-15 x 4-7 pm, yellowish green, + arranged in radiating rows. Perithecia usually present and abundant, typically occurring in center of small, circular (0.3-0.6 mm in diam.) patch of thallus with small and rounded lobes located at or near lobes tips, single or paired (rarely in 3s), typically hemispheric, never (ob-)conical, with rounded apex, 0007-2745/98/147-152$0.75/0 This content downloaded from 157.55.39.107 on Wed, 30 Mar 2016 06:34:55 UTC All use subject to http://about.jstor.org/terms 148 THE BRYOLOGIST [VOL. 101