Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
prospection of the Clavariaceae family. Ramariopsis sensu
Corner was found as a monophyletic group, with
Scytinopogon as its sister group, which agree with Corner
(1970) proposals. Ramariopsis sensu Petersen was rejected
as a monophyletic natural genus.
667 - Molecular study of the Caloplaca saxicola group
on the background of morphological taxa
E. Gaya 1* , P. Navarro-Rosinés 1 , F. Lutzoni 2 & N. Hladun 1
1 Dept.Biologia Vegetal.Facultat de Biologia.Universitat de
Barcelona, Av.Diagonal 645. 08028 Barcelona, Spain. -
2 Dept. of Biology. Duke University, Box 90338. Durham,
North Carolina, U.S.A. - E-mail: gaya@porthos.bio.ub.es
Caloplaca (Teloschistaceae, Ascomycota) with more than
1000 species can be considered one of the most complex
and diversified genus among crustose lichens. Its
delimitation has been always problematic due mostly to the
strong similarity between lobed species of Caloplaca and
species of other genera within this family, such as
Xanthoria. Among all lobed Caloplaca species, the
Saxicola group has been the most controversial
taxonomically. Here we report the results from
phylogenetic analyses of the nuclear rDNA internal
trancribed spacers (ITS) sequence data for 60 specimens
belonging to the Saxicola group. Collections from Europe,
North America and Asia are included. We have used these
molecular data to compare the current phenotypic
delimitation of certain species. Hence, a morphological
comprehensive study of the group is provided with an
emphasis on the enigmatic C. arnoldii s. auct., the
phenotypically variable C. saxicola s. str. and the concept
of C. biatorina in the different continents. A proposal for
achieving a new and stable classification of this group will
be presented.
668 - Phylogeny of the genus Arachnomyces and its
anamorphs
C. F. Gibas 1* , L. Sigler 1 , R.C. Summerbell 2 & R.S. Currah 3
1 University of Alberta Microfungus Collection and
Herbarium, Edmonton, Alberta, T6G 2E1, Canada. -
2 Centraalbureau voor Schimmelcultures, Baarn, The
Netherlands. -
3 Department of Biological Sciences,
University of Alberta, Edmonton, Alberta, T6G 2E9,
Canada. - E-mail: cgibas@ualberta.ca
Arachnomyces is a genus of cleistothecial ascomycetes that
has morphological similarities to the Onygenaceae and the
Gymnoascaceae but is not accommodated well in either
taxon. The phylogeny of the genus Arachnomyces and
related anamorphs was studied using nuclear SSU rDNA
gene sequences. Partial sequences were determined from
ex-type cultures representing A. minimus, A. nodosetosus
(anamorph Onychocola canadensis), A. kanei (anamorph
O. kanei) and A. gracilis (anamorph Malbranchea sp.) and
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Book of Abstracts
aligned together with corresponding sequences of forty
other ascomycetes. Phylogenetic analysis using maximum
parsimony showed the genus Arachnomyces is
monophyletic, includes the hyphomycete Malbranchea
sclerotica, and forms a separate lineage within the
Eurotiomycetes. All known anamorphs in this lineage are
arthroconidial and have been placed either in Onychocola
(A. nodosetosus, A. kanei) or in Malbranchea (A. gracilis).
Onychocola is chosen as the most appropriate taxon for the
arthroconidial states of Arachnomyces and thus
Malbranchea sclerotica and the anamorph of A. gracilis
are treated as species within Onychocola.
669 - Analysis of 18S ribosomal RNA gene sequences
reveals the phylogenetic relationships of the genus
Mycosphaerella
S.B. Goodwin * & J.R. Cavaletto
USDA-ARS / Purdue University, Department of Botany and
Plant Pathology, 1155 Lilly Hall, West Lafayette, IN
47907-1155, U.S.A. - E-mail: sgoodwin@purdue.edu
Mycosphaerella is one of the largest groups of plant
pathogenic fungi with more than 1800 species names.
Anamorphs associated with Mycosphaerella number more
than 40, many of which also are economically important
with large numbers of species. For example, Cercospora
and Septoria contain more than 3000 and 1000 species
names, respectively, most of which probably were derived
from species with a Mycosphaerella teleomorph. Despite
their common occurrence and high economic importance,
members of this genus have been under-represented in
phylogenetic analyses and the taxonomic position of
Mycosphaerella is uncertain. Most taxonomists place the
genus in the order Dothideales. However, this conclusion
has not been supported by limited analyses of 18S
ribosomal RNA gene sequences. To test whether the genus
Mycosphaerella belongs in the order Dothideales, 18S
rDNA sequences were obtained from five species
representing the major groups within the genus identified
in previous analyses of ITS sequences. All five species of
Mycosphaerella clustered together but separate from
species of Dothidea and formed a basal group to the other
loculoascomycetes in a neighbor-joining analysis of 109
18S sequences. Species of Dothidea clustered with those of
Botryosphaeria, another genus of uncertain taxonomic
position. Inclusion of Mycosphaerella within the
Dothideales was not supported by this analysis and a new
order may be needed to accommodate species of
Mycosphaerella and related genera.
670 - Biogeography and species concepts - Lentinus
lindquistii is Lentinus tigrinus, a circum-global species
E.A. Grand * , R.H. Petersen & K.W. Hughes
The University of Tennessee, 437 Hesler, Knoxville,
Tennessee 37996-1100, U.S.A.