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Pleosporales - CBS - KNAW

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Fungal Diversity<br />

Loculohypoxylon M.E. Barr, Mycotaxon 3: 326 (1976).<br />

(Teichosporaceae)<br />

Generic description<br />

Habitat terrestrial, saprobic. Ascomata relatively small,<br />

gregarious, immersed to erumpent, globose or subglobose,<br />

forming under a clypeus, papillate, ostiolate.<br />

Peridium thin, a single layer comprising hyaline thinwalled<br />

cells of textura angularis or textura prismatica.<br />

Hamathecium of septate pseudoparaphyses. Asci (2–4-)8-<br />

spored, bitunicate, cylindrical to cylindro-clavate, with a<br />

short, furcate pedicel, and wide ocular chamber. Ascospores<br />

broadly elliptic to subglobose, often apiculate at<br />

both ends, pale to dark brown, aseptate, with a germ<br />

slit.<br />

Anamorphs reported for genus: none.<br />

Literature: von Arx and Müller 1975; Barr 1976.<br />

Type species<br />

Loculohypoxylon grandineum (Berk. & Rav.) Barr, Mycotaxon<br />

3: 326 (1976). (Fig. 49)<br />

≡ Diatrype grandinea Berk. & Rav., in Berkeley,<br />

Grevillea 4: 95 (1876).<br />

Ascomata 85–130 μm high×75–145 μm diam., gregarious,<br />

immersed to widely erumpent, globose or subglobose,<br />

under a reddish brown to black clypeus, papillate,<br />

ostiolate (Fig. 49a and b). Peridium 18–30 μm thick<br />

laterally, 1-layered, composed of hyaline thin-walled cells<br />

of textura angularis to prismatica, cells up to 5×9 μm<br />

diam., cell wall 0.5–1 μm thick, apex cells smaller and<br />

walls thicker (Fig. 49c). Hamathecium comprising 2–3 μm<br />

broad, septate pseudoparaphyses. Asci 70–90×10–<br />

12.5 μm (x ¼ 76:5 10:9mm, n=10), (2–4-)8-spored,<br />

bitunicate, cylindrical to cylindro-clavate, with a short,<br />

furcate pedicel, up to 25 μm long, with a wide ocular chamber<br />

(Fig. 49f, g, and h). Ascospores 7.5–10×5–7 μm<br />

(x ¼ 8:3 5:9mm, n=10), uniseriate to partially overlapping<br />

at the upper part, broadly elliptic to subglobose, often<br />

apiculate at both ends, pale to dark brown, aseptate, with a<br />

germ slit (Fig. 49d and e).<br />

Anamorph: none reported.<br />

Material examined: USA, New Jersey, Newfield, on<br />

bark of Quercus coccinea, Sept. 1878, as Diatrype<br />

grandinea, Ellis N.A.F. 494 (NY, MASS); on Quercus<br />

sp. wood, Nov. 1893, as Anthostoma grandinea B. & Rav.,<br />

Ellis & Everhart, N.A.F. 494 (NY); Newfield, Oct. 1881,<br />

as Diatrype grandinea (NY); Newfield, Jan. 1882, on<br />

Quercus coccinea, asDiatrype grandinea B. & Rav, Ex<br />

Herb Ellis (NY); Newfield, Nov. 1893, as Anthostoma<br />

grandinea, on bark of fallen trunks of Quercus coccinea<br />

(NY).<br />

Notes<br />

Morphology<br />

Loculohypoxylon grandineum is one of the rare pleosporalean<br />

species having aseptate ascospores. When emphasis<br />

is given to ascospore morphology, Semidelitschia<br />

(monotypified by S. agasmatica Cain & Luck-Allen) is the<br />

most comparable genus. The large ascomata and ascospores,<br />

the mucilaginous sheath surrounding the ascospores<br />

as well as the coprophilous habitat of S. agasmatica differ<br />

from L. grandineum greatly. Thus Loculohypoxylon was<br />

introduced as a new genus.<br />

Phylogenetic study<br />

None.<br />

Concluding remarks<br />

Aseptate ascospores are rare in <strong>Pleosporales</strong>, and the<br />

position of this fungus needs further verification. The familial<br />

status of Loculohypoxylon in Teichosporaceae is questionable,<br />

as it is simply based on the similarity of living habitat, ascomata<br />

and asci with Immotthia and Teichospora (Barr 2002).<br />

Lophionema Sacc., Syll. fung. (Abellini) 2: 717 (1883).<br />

(<strong>Pleosporales</strong>, genera incertae sedis)<br />

Generic description<br />

Habitat terrestrial, saprobic? Ascomata solitary, scattered or<br />

in small groups, immersed to erumpent, globose to subglobose,<br />

with a flattened base, wall black, papillate, ostiolate.<br />

Peridium comprising two types of cells which merge in the<br />

middle. Hamathecium of trabeculate pseudoparaphyses,<br />

septate, rarely anastomosing and branching. Asci 8-spored,<br />

bitunicate, fissitunicate unknown, clavate to cylindro-clavate,<br />

with a short and furcate pedicel and a small inconspicuous<br />

ocular chamber. Ascospores filliform, hyaline to pale yellow,<br />

multi-septate, slightly constricted at each septum.<br />

Anamorphs reported for genus: none.<br />

Literature: Barr1992b; ChestersandBell1970; Ellis and<br />

Everhart 1892; Höhnel 1909; Solheim 1949.<br />

Type species<br />

Lophionema vermisporum (Ellis) Sacc., Syll. fung. (Abellini)<br />

2: 717 (1883). (Fig. 50)<br />

≡ Lophiostoma vermispora Ellis, Bull. Torrey bot. Club<br />

9: 19 (1882).<br />

Ascomata 320–430 μm high×280–350 μm diam.,<br />

solitary, scattered or in small groups of 2–3, immersed to<br />

erumpent, globose to subglobose, black, papillate, ostiolate.<br />

Papilla 80–120 μm high, up to 150 μm broad, cylindrical to<br />

somewhat vertically flattened neck; mostly with a short

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