Pleosporales - CBS - KNAW

Fungal Diversity
190 μm high (Fig. 101a). Peridium 20–33 μm thick, 1-
layered, composed of several layers of heavily pigmented,
elongate cells of textura angularis, cells up to 6.3×5 μm
diam., cell wall 1–1.5 μm thick (Fig. 101b and c).
Hamathecium of dense, long trabeculate pseudoparaphyses
1–2 μm broad, hyaline, aseptate, decomposing when mature.
Asci 165–220×33–42.5 μm, 8-spored, bitunicate, broadly
clavate, with a small, thin and furcate pedicel, 35–50 μm long,
3–5 μm broad, ocular chamber not observed (Fig. 101d and
e). Ascospores 68–93×12.5–16 μm, 3–4 seriate to uniseriate
near the base, cylindrical to cylindro-clavate with rounded
ends, brown, (6-)7 transverse septa, easily breaking into
partspores, central cells triangular in transverse section but
rectangular in vertical section, 14–16.5×8–10 μm long, apical
cells 12.5–15×11.5–17.5 μm long (Fig. 101f and g).
Anamorph: none reported.
Material examined: SPAIN, Canary Islands, Tenerifa
Las Canadas, on rabbit? droppings, Mar. 1986, J.A. von
Arx (HCBS 9812, holotype).
Notes
Morphology
Spororminula was formally established by von Arx and van
der Aa (1987) according to its “ostiolate ascomata, elongated
ascospore separated into part cells by transverse septa and
without germ slits”, and was monotypified by S. tenerifae.
Currently, only one species was included in this genus.
Phylogenetic study
Based on a phylogenetic analysis of ITS-nLSU rDNA, mtSSU
rDNA and ß-tubulin sequences, Spororminula tenerifae
nested in the clade of Preussia, thus Spororminula was
treated as a synonym of Preussia (Kruys and Wedin 2009).
Concluding remarks
To clarify its relationship with other genera of Sporormiaceae,
further phylogenetic study is needed, which should
include additional related taxa.
Excluded and doubtful genera
Kriegeriella Höhn., Annls mycol. 16: 39 (1918). (Dothideomycetes,
families incertae sedis, Microthyriaceae)
Generic description
Habitat terrestrial, saprobic? Ascomata small, solitary,
scattered, superficial, subglobose, black, roughened, apex
Fig. 101 Spororminula tenerifae (from HCBS 9812, holotype). a b
Appearance of ascomata on the host surface. b, c Sections of the
partial peridium. Note the elongate cells of textura angularis. d, e
Asci with thin pedicels. f, g Ascospores, which may break into part
spores. Scale bars: a=0.5 mm, b=100 μm, c=50 μm, d–g=20 μm
no obvious opening. Peridium thin, composed of a single
type of lightly pigmented thin-walled cells. Hamathecium
long cellular pseudoparaphyses, septate. Asci 8-spored,
bitunicate, obpyriform. Ascospores hyaline, turning brown
when mature, multi-septate, constricted at each septum.
Anamorphs reported for genus: none.
Literature: von Arx and Müller 1975; Barr1975, 1987b;
Eriksson 2006; Lumbsch and Huhndorf 2007.
Type species
Kriegeriella mirabilis Höhn., Annls mycol. 16: 39 (1918)
(Fig. 102)
Ascomata 100–120 μm high×150–220 μm diam., solitary,
scattered, superficial, with basal wall flattened on the surface of
the substrate, subglobose, black, roughened, apex no obvious
opening (Fig. 102a and e). Peridium thin, composed of a
single type of lightly pigmented thin-walled cells, cells up to
12×5 μm diam. in front view, cell wall less than 1 μm thick,
apex cells smaller and walls thicker (Fig. 102a and f).
Hamathecium long cellular pseudoparaphyses, 1.5–2 μm
wide, septate. Asci 65–85×31–36 μm (x ¼ 63:1 33mm, n=
10), 8-spored, bitunicate, fissitunicate undetermined, obpyriform,
no pedicel, no ocular chamber was seen (Fig. 102c and
g). Ascospores 28–37.5×8–11 μm (x ¼ 32:6 10mm, n=
10), 8-seriate, fusoid with broadly rounded ends, hyaline,
turning brown when mature, 5–6-septate, constricted at each
septum, the upper first-cell longer and broader than the lower
ones with semi-round shape, smooth (Fig. 102d, h, i).
Anamorph: see Fig. b.
Material examined: On the leaves of Faulenden nadeln
von Pinus silvestris, bei Roñigstein, Sept. 1896, W. Rueges.
(S reg. nr F12638, isolectotype).
Notes
Morphology
Kriegeriella was formally established by von Höhnel (1918b)
and was represented by two species, i.e. K. mirabilis and K.
transiens; it was typified by K. mirabilis and assigned to
Microthyriaceae. Subsequently, Kriegeriella was assigned to
the subfamily of Aulographiodeae (Microthyriaceae)
(Batista et al. 1959), Asterinaceae (Hemisphaeriales) (Luttrell
1973) and Pseudosphaeriaceae (Dothideales) (Barr
1975).
After checking the original description and the type
specimens of K. mirabilis and K. transiens, no significant