Bulletin of the British Museum (Natural History)
Bulletin of the British Museum (Natural History)
Bulletin of the British Museum (Natural History)
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156 BRIAN JOHN COPPINS<br />
tinuing into it as stout pigmented paraphyses; ascogenous hyphae similarly pigmented, but with<br />
short swollen cells to 5 /xm wide. Excipulum not evident in available material.<br />
Pycnidia numerous, black, sessile and c. 40-60 /xm diam, or more usually borne on black<br />
stalks (pycnidiophores) and 80-300x40-70 ^im (including stalk); stalks simple, or sometimes<br />
branched and bearing up to four pycnidia; upper part (pycnidial wall) dark olive but lower part<br />
(stalk tissue) reddish brown, both parts K— , Conidia {mesoconidia) short cylindrical, 2-3-<br />
3-6xl-l-3/>im<br />
Chemistry: Thallus PD— ; sections <strong>of</strong> apo<strong>the</strong>cia and thallus C-; material insufficient for<br />
analysis by t.l.c.<br />
Observations: With its black, subglobose to tuberculate apo<strong>the</strong>cia, black, stalked pycnidia,<br />
inconspicuous thallus, and occurrence on lignum, M. melaeniza is indistinguishable in external<br />
appearance from M. misella and M. nigella. Microscopically, M. misella can be distinguished by<br />
<strong>the</strong> olivaceous (K+ violet) pigment in its hymenium and pycnidia, and its ± hyaline hypo<strong>the</strong>cium;<br />
and M. nigra can be distinguished by <strong>the</strong> purple-brown (K+ green, HNO3+ purple-red)<br />
pigment in its hymenium, hypo<strong>the</strong>cium and pycnidia. With respect to apo<strong>the</strong>cial and pycnidial<br />
pigmentation and structure, M. melaeniza is almost identical to M. botryoides. However, M.<br />
botryoides is rarely lignicolous, and has larger, <strong>of</strong>ten septate spores, and longer mesoconidia. M.<br />
muhrii has similar apo<strong>the</strong>cial pigments to those <strong>of</strong> M. melaeniza, but is readily distinguished by<br />
its larger, adnate apo<strong>the</strong>cia (which <strong>of</strong>ten have a pale marginal rim), larger spores, well<br />
developed excipulum, and lack <strong>of</strong> stalked pycnidia.<br />
Habitat and distribution: M. melaeniza is a rare species, known only from three collections<br />
made in Sweden (Angermanland, Halsingland, and Smaland) where it occurred on <strong>the</strong> lignum<br />
<strong>of</strong> conifer trunks. Associated species identified on <strong>the</strong> examined collections include Calicium<br />
salicinum, Cetraria pinastri, Chaeno<strong>the</strong>copsis lignicola, Cladonia spp. (squamules), Dimerella<br />
diluta, Hypogymnia physodes, Lecanora symmicta agg., Micarea anterior, M. misella, M.<br />
prasina, Usnea sp., and Lophozia sp.<br />
25. Micarea melanobola (Nyl.) Coppins, comb. nov.<br />
(Figs 21c, 46B-C)<br />
Lecidea melanobola Nyl. in Flora, Jena 50: 371 (1867). - Catillaria melanobola (Nyl.) Vainio in Acta Soc.<br />
Fauna Fl. fenn. 57 (2): 465 (1934). - Lecidea erysiboides *L. melanobola (Nyl.) Nyl. in Hue in Revue Bot.<br />
Courrensan 5: 103 (1886). - Catillaria |3. byssacea f. melanobola (Nyl.) Blomb. & Forss., Enum. PI.<br />
Scand. : 91 (1880). - Micarea prasina f . melanobola Hedl. in Bih. K. svenska VetenskAkad. Handl. Ill, 18<br />
(3): 87 (1892). Type: Finland, Tavastia australis, Kuhmois [Kuhomoinen], on bark <strong>of</strong> Picea abies ,<br />
/. P. Norrlin (H-NYL 21614 -lectotype!; isolectotypes: H-NYLp.m. 4504!, H!).<br />
Thallus effuse, thin and indistinct, <strong>of</strong> scattered to ± coherent, minute olivaceous granules<br />
(goniocysts), c. 12-25 jxm diam, which appear ± gelatinous when moist. Outermost hyphae <strong>of</strong><br />
goniocysts with greenish, K-l- violet walls. Phycobiont micareoid, cells 4-7 (xm diam.<br />
Apo<strong>the</strong>cia numerous, convex-hemispherical, immarginate, dark grey to black, 0- 1-0-24 mm<br />
diam. Hymenium 30-35 /xm tall, hyaline, but with a clearly delimited, dark green epi<strong>the</strong>cium,<br />
K+ deep violet, C+ violet, HNOs-l- red; pigment closely bound to (? or also in) <strong>the</strong> apical walls<br />
<strong>of</strong> <strong>the</strong> paraphyses, and also present in <strong>the</strong> gel-matrix and apical walls <strong>of</strong> <strong>the</strong> asci. Asci clavate,<br />
30-35x9-11 fjLm, upper wall(s) sometimes tinged with greenish, K+ violet pigment. Spores<br />
ellipsoid, ovoid, or oblong-ovoid, with obtuse apices, 0-1-septate, 7-9-7x2-5-3-3 /xm. Paraphyses<br />
scanty, branched and anastomosing, thin, 0-5-1 /xm wide; apices thickened with greenish<br />
(K-l- violet) pigment and up to 1-7 /xm wide, <strong>of</strong>ten overtopping <strong>the</strong> tops <strong>of</strong> <strong>the</strong> asci. Hypo<strong>the</strong>cium<br />
25-70 /xm tall, hyaline or dilute dull yellowish. Excipulum indistinct, sometimes evident as a<br />
non-amyloid, narrow (c. 10-15 /xm), reflexed zone <strong>of</strong> radiating, branched and anastomosing<br />
hyphae, 0-5-1 /xm wide.<br />
Pycnidia numerous but small and inconspicuous, sessile, black, with dark greenish (K-l-<br />
violet) walls; <strong>of</strong> two types: (a) 40-50 /xm diam; conidia (mesoconidia) cylindrical or ovoid-<br />
1866,<br />
I