Pleosporales - CBS - KNAW

Fungal Diversity
and nearly black and opaque when mature, non-septate,
smooth-walled, with a full length germ slit, surrounded
by a broad gelatinous sheath (Fig. 86c and d).
Anamorph: none reported.
Material examined: CANADA, Alberta, North of
Beaver Mines, on sheep dung, 28 Jul. 1962, E.R. Luck-
Allen, (TRTC 41607, paratype); USA, Montana: Gallatin
County, 60 min S of Bozeman, on sheep dung, 2 Sept.
1957, Cain (TRTC 42032, paratype); Stillwater County
Columbus, on cow dung, 3 Sept. 1957, Cain (TRTC 42031,
paratype); South Dakota, Meade Co.: South of Wall, on
cow dung, 3 Sept. 1962, Cain (TRTC 40697, holotype).
Notes
Morphology
Semidelitschia was formally establishedbyCainandLuck-
Allen (1969) and was assigned to Sporormiaceae. Although it
is similar to Delitschia, it differs as the ascospores are 1-
celled, as opposed to 2-celled. Subsequently, Semidelitschia
was transferred to Delitschiaceae together with Delitschia
(Barr 2000). Currently, three species are listed under this
genus, i.e. S. agasmatica Cain & Luck-Allen, S. nanostellata
A.E. Bell & Mahoney and S. tetraspora J.H. Mirza & S.M.
Khan (Index Fungorum) although the number of species in
the genus are given as only two in Kirk et al. (2008).
Phylogenetic study
None.
Concluding remarks
This is a clearly defined genus that differs from
Delitschia in having 1-celled ascospores. Cultures of S.
agasmatica are needed for sequencing and for establishing
the placement and uniqueness of the genus.
Setomelanomma M. Morelet, Bull. Soc. Sci. nat. Arch.
Toulon et du Var 227:15 (1980). (Phaeosphaeriaceae)
Generic description
Habitat terrestrial, hemibiotrophic or biotrophic. Ascomata
small, solitary, scattered, immersed, erumpent to superficial,
globose to subglobose, black; with or without a small
papilla, apex covered with setae and a periphysate ostiole.
Peridium thin, 1-layered, composed of several layers of
cells of textura angularis. Hamathecium of dense, 1–2 μm
broad pseudoparaphyses, septate, anastomosing. Asci 8-
spored, bitunicate, broadly cylindrical. Ascospores fusoid to
broadly clavate, pale brown to brown, 3-septate.
Anamorphs reported for genus: none.
Literature: Leonard and Suggs 1974; Morelet 1980;
Rossman et al. 2002; Schochetal.2009; Zhang et al. 2009a.
Type species
Setomelanomma holmii M. Morelet, Bulletin de la Société
des Sciences naturelles et d’Archéologie de Toulon et du
Var 36 (no. 227): 15 (1980). (Fig. 87)
(Some information in the following description is from
Rossman et al. (2002))
Ascomata 80–250 μm diam., solitary, scattered, immersed,
erumpent to superficial, globose to subglobose,
black, with setae; with or without a small papilla, apex
covered with setae and a periphysate ostiole. Peridium 15–
25 μm thick, 1-layered, composed of several layers of cells
of textura angularis, cell wall thinner and more lightly
pigmented towards centrum, cell wall thicker near the apex.
Hamathecium of dense, 1–2 μm broad pseudoparaphyses,
thicker near the base, septate, anastomosing (Fig. 87a and
d). Asci 70–100×11–14 μm, 8-spored, bitunicate, broadly
cylindrical with a short, thick, furcate pedicel, with a small
ocular chamber (Fig. 87a, b and c). Ascospores 16–21×5–
6.5 μm, obliquely uniseriate and partially overlapping to
biseriate, fusoid to broadly clavate with broadly to narrowly
rounded ends, pale brown to brown, 3-septate, slightly
constricted at the median septum, smooth (Fig. 87e).
Anamorph: none reported.
Material examined: FRANCE, Leuglay, on dying twigs
of Picea pungens. 8 May 1987, leg. M. Morelet (UPS F-
117969 (slide), isotype).
Notes
Morphology
Setomelanomma was formally established by Morelet
(1980) as a monotypic genus represented by S. holmii,
which was collected in France. The description, however, is
not detailed and lacks illustrations. Rossman et al. (2002)
collected this species in North America and detailed studies
were conducted including both morphology and phylogeny.
The bitunicate, broadly cylindrical asci, cellular pseudoparaphyses
as well as the pale brown, septate ascospores with
a median primary septum point Setomelanomma to
Phaeosphaeriaceae as defined by Barr (1992a) and
Eriksson et al. (2002) (Rossman et al. 2002). However, its
setose ascomata, brown and 3-septate ascospores together
with its residence in conifers distinguish it from all other
genera under Phaeosphaeriaceae (Rossman et al. 2002).
Setomelanomma is mostly comparable with Kalmusia and
Phaeosphaeria. Setomelanomma can be distinguished from
Kalmusia by its erumpent to superficial ascomata with
almost no papilla, and Phaeosphaeria differs from Setomelanomma
by its host spectrum and reported anamorphic
stages (Rossman et al. 2002). Currently, five species are
included in Setomelanomma, namely S. holmii, S. monoceras,
S. prolata K.J. Leonard & Suggs, S. rostrata (K.J. Leonard) K.