Pleosporales - CBS - KNAW

Fungal Diversity
furcate pedicel and a small ocular chamber. Ascospores
hyaline to pale brown, ellipsoid to fusoid, 1-septate,
constricted at the septum (Barr 1990a).
Anamorphs reported for genus: Dendrophoma (Bose 1961).
Literature: von Arx and Müller 1975; Bose 1961; Barr
1990a; Dennis 1978; Eriksson 1967a; von Höhnel 1919;
Luttrell 1973; Munk 1957; Zhang et al. 2009a.
Type species
Keissleriella aesculi (Höhn.) Höhn., Sber. Akad. Wiss.
Wien, Math.-naturw. Kl., Abt. 1 128: 582 (1919). (Fig. 42)
≡ Pyrenochaeta aesculi Höhn., Ber. dt. bot. Ges. 35: 249
(1917).
Ascomata ca. 250μm high×450 μm diam., gregarious,
immersed to erumpent, globose or subglobose, with a
small black papilla, ca. 75μm high and 110 μm broad,
with short black external setae (Fig. 42a). Peridium ca.
25–40 μm wide laterally, up to 70 μm near the apex,
thinner at the base, comprising two types of cells which
merge in the middle; outer cells composed of small
heavily pigmented thick-walled cells, cells ca. 4 μm
diam., cell wall up to 4 μm thick, and thick near the apex
and thinner laterally and absent in the immersed part of
the ascoma, inner cells less pigmented, comprising
lightly pigmented to hyaline cells, 5–7 μm thick
(Fig. 42a). Hamathecium of dense, long pseudoparaphyses,
0.8–1.2 μm broad, rarely septate, anastomosing and
branching, thicker near the base, ca. 2μm, constricted
near the septum (Fig. 42b). Asci 80–120×6–11 μm (x ¼
101 8:5mm, n=10), 4- or 8-spored, bitunicate, fissitunicate,
cylindro-clavate, with a furcate pedicel which is
up to 20–40 μm long, with a small ocular chamber
(Fig. 42e and f). Ascospores 13–18×4–5.5 μm
(x ¼ 14:5 4:8mm, n=10), obliquely uniseriate and partially
overlapping, fusoid with narrowly rounded ends,
hyaline, 1-septate, constricted at the septum, smooth
(Fig. 42c and d).
Anamorph: none reported.
Material examined: AUSTRIA, Brentenmaistal in the
Viennese forest, Aesculus hippocastanum L., 1916, Höhnel
(FH, holotype of Otthiella aesculi). (Note: only two slides;
setae cannot be seen from the slides but could be seen from
the drawings on the cover).
Notes
Morphology
Keissleriella is characterized by ascomata with setae in
and over the papilla, asci are cylindrical and ascospores are
hyaline, 1-septate. Based on the morphological characters,
K. aesculi was regarded as conspecific with K. sambucina;
as an earlier epithet, K. sambusina typifies the genus (see
comments by Barr 1990a). Munk (1957) placed Trichometasphaeria
and Keissleriella in Massarinaceae, and distinguished
them by their substrates (Trichometasphaeria
occurs on herbaceous plants and Keissleriella on woody
substrates). Bose (1961) combined Trichometasphaeria
under Keissleriella, which was followed by some workers
(von Arx and Müller 1975; Dennis 1978; Eriksson 1967a;
Luttrell 1973). Barr (1990a), however, maintained these as
distinct genera based on the differences of peridium
structure and pseudoparaphyses.
Phylogenetic study
The phylogeny of Keissleriella is poorly studied.
Limited phylogenetic information indicates that K. cladophila
forms a robust clade with other species of Lentitheciaceae
(Zhang et al. 2009a).
Concluding remarks
The presence of black setae on the surface of papilla is a
striking character of Keissleriella, but phylogenetic significance
of setae is undetermined yet.
Lentithecium K.D. Hyde, J. Fourn. & Yin. Zhang, Fungal
Divers. 38: 234 (2009). (Lentitheciaceae)
= Tingoldiago K. Hirayama & Kaz. Tanaka, Mycologia
102: 740 (2010) syn. nov.
Generic description
Habitat freshwater, saprobic. Ascomata small, scattered
or gregarious, immersed, slightly erumpent, depressed
spherical to lenticular, ostiolate, papillate or epapillate.
Peridium thin. Hamathecium of cellular pseudoparaphyses.
Asci 8-ascospored, bitunicate, fissitunicate, clavate,
short-stipitate. Ascospores broadly fusoid with broadly
rounded ends, 1-septate, constricted, hyaline, usually
with sheath.
Anamorphs reported for genus: none.
Literature: Shearer et al. 2009; Zhang et al. 2009a, b.
Type species
Lentithecium fluviatile (Aptroot & Van Ryck.) K.D. Hyde, J.
Fourn. & Yin. Zhang, Fungal Divers. 38: 234 (2009). (Fig. 43)
≡ Massarina fluviatilis Aptroot & Van Ryck., Nova
Hedwigia 73: 162 (2001).
Ascomata 230–260 μm high×280–325 μm diam., scattered
or gregarious, immersed, slightly erumpent, subglobose to
depressed spherical, under a small black pseudostroma
originating from the apical part of the peridium, apex slightly
papillate, ostiole rounded, 60–70 μm diam. (Fig. 43a and b).
Peridium 15–20 μm thick at sides and at base, comprising 4–5
layers of angular cells more thick-walled outwards, 50–55 μm