Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
Madeira. A similar fungus was later found at two separate
localities near Lisbon. Two morphologically distinct
Phomopsis species were found on the stems. The
Diaporthe species were compared with specimens in the
herbaria of Padova (PAD) and Coimbra (COI). The
specimen in PAD had unicellular ascospores and appeared
to be immature. A specimen in COI (285) collected by
Moller is a typical Diaporthe and was regarded as D.
foeniculacea. The specimens collected from Madeira and
near Lisbon correlated morphologically with COI 285 and
it is recommended that the name Diaporthe foeniculacea
should be retained. One of the Phomopsis spp. on fennel
stems correlated with Camaras description of P.
foeniculina, but it is not the anamorph of D. foeniculacea.
The teleomorph of P. foeniculina has not yet been found.
Diaporthe foeniculacea is self-fertile and readily produces
perithecia in culture.
752 - Characterization of Pisolithus in Thailand
C. Phosri 1* , R. Watling 2 , M.P. Martín 3 & A.J.S. Whalley 1
1 School of Biomolecular Sciences, Liverpool John Moores
University, Byrom Street, Liverpool, L3 3AF, U.K. -
2 Caledonian Mycological Enterprises, Crelah, 26
Blinkbonny Ave, Edinburgh, EH4 3HU, Scotland, U.K. -
3 Real Jardin Botnanico de Madrid, CSIC, Plaza de Murillo
2, 28014, Madrid, Spain. - E-mail: bmscphos@livjm.ac.uk
A detailed study of Pisolithus, Scleroderma and Astraeus
from a variety of hosts and geographic areas of Thailand is
currently being undertaken to assess their potential for
enhancement of growth in inoculated seedlings of Pinus
kesiya and Eucalyptus camaldulensis. The results
demonstrated that basidiospores from most Pisolithus
isolates are ornamented with well-developed spines. At
least 2 groups of spore types occur. Most basidiospores
collected from Eucalyptus are characterized by numerous
echinulate, blunt spines whilst basidiospores with
coalesced spines joined at their tip have been found mainly
in isolates collected from pine forest. This corresponds
with a recent study of the internal transcribed spacer (ITS)
DNA sequence. Sequences for 14 Pisolithus isolates
associated with native Mediterranean hosts, Eucalyptus
camaldulensis and Pinus kesiya were compared with those
in GenBank. The phylogenetic analyses grouped Thai
Pisolithus isolates into 2 distinct groups. Group 1 contained
Pisolithus isolates collected from Pine forest and Group 2
contained those collected from Eucalyptus plantation. This
present study indicates that basidiospore ornamentation,
together with ITS sequences, can distinguish two
distinctive Pisolithus groups in Thailand which also exhibit
clear host association.
753 - Cercospora species from Venezuela described by
C. Chupp and A.S. Muller
N. Pons 1* , U. Braun 2 & P.W. Crous 3
1 El Milagro, calle F, número 3, Maracay 2101, Venezuela.
- 2 Martin-Luther-University, Institute of Geobotany and
Botanical Garden, Neuwerk 21, D-06099, Halle, Germany.
- 3 University of Stellenbosch, Stellenbosch 7602, South
Africa. - E-mail: carinipo@cantv.net
The species Cercospora caracasensis (on Annona
purpurea, Annonaceae), C. centrosematis (on Centrosema
virginianum, Leguminosae-Papilionoideae), C. cestri (on
Cestrum latifolium, Solanaceae), C. chirguensis (on
Curatella americana, Dilleniaceae), C. conocarpi (on
Conocarpus erectus, Combretaceae) and C. cyclantherae
(on Cyclanthera pedata, Cucurbitaceae), described by C.
Chupp and A.S. Muller, were revised. Based on the
morphological characteristics of reproductive structures
exhibited by the type specimens and, on the correlation of
these criteria with available molecular data, the following
new species are proposed: Passalora centrosematis,
Stenella cestri, Pseudocercospora chirguensis and P.
conocarpi. Cercospora caracasensis is reduced to
synonymy with Pseudocercospora annonae-squamosae,
and C. cyclantherae is considered a synonym of C. apii
s.lat. Descriptions and illustrations of the species treated
are also provided.
754 - Morphological characters of Lentinellus cultures
N.V. Psurtseva 1* & Ph.B. Gannibal 2
1 Komarov Botanical Institute RAS, Prof. Popov Str., 2, St.
Petersburg 197376, Russia. - 2 St. Petersburg State
University, Dept. of Botany, Universitetskaja nab., 7/9, St.
Petersburg 199034, Russia. - E-mail:
NadyaPsu@NP1512.spb.edu
The taxonomy of the genus Lentinellus has recently been
reevaluated by Dr. R.H. Petersen and his Lab (The
University of Tennessee, USA) using classical morphology
of type specimens, mating study and molecular analysis.
Cultural study of Lentinellus strains received from Dr.
Petersen's Lab have been undertaken to evaluate the
diagnostic potential of mycelial characters in the genus.
Dikaryon cultures from different intersterility groups
belonging to L. ursinus, L. castoreus, L vulpinus, L.
montanus, L. flabelliformis and L. micheneri were used.
The strains were grown on MEA and PDA media. Indexes
of growth, macro- and micromorphology were described
using traditional terminology. Mycelial structure was
studied from scanning electron microscope images.
Laccase and tyrosinase activities were studied by plate
diffusion method (Bavendamm reaction) and spot tests
(substrates: guaiacol, syringaldazine and l-tyrosine). The
strains' capacity for fructification was evaluated on
sawdust/bran substrate. It was shown that different species
were distinguishable by differences in growth indexes,
Book of Abstracts 227