Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
622 - Impact of rhizomorph structure on systematics of
Hymenomycetes (Basidiomycota)
R. Agerer
University of München, Department Biology I, Biodiversity
Research: Systematic Mycology, Menzinger Str. 67, D-
80638 München, Germany. - E-mail:
myrrhmyk@botanik.biologie.uni-muenchen.de
Rhizomorphs can be used to confirm or to clarify
relationships within Hymenomycetes (Agerer 1999, 2002,
Hahn et al. 2001). Recent studies have shown that the final
structure in combination with the ontogeny of rhizomorphs
are important means to discern fungal relationships.
Virtually all families of Boletales s. l. (Gomphidiaceae,
Tapinellaceae, and Truncocolumellaceae excluded) have an
identical type of rhizomorphs, the boletoid type (Agerer
1999). The recently by DNA-analyses repeatedly
confirmed relationship between Gomphales, Geastrales and
Gautieriales is characterized by ramarioid rhizomorphs
(Agerer 1999, Hahn et al. 2001), which are unknown in any
other fungal group. Agaricoid rhizomorphs (Agerer 1999,
2002) are typical of Agaricaceae and Lycoperdales. The
unique rhizomorph structures are shown and their impact
on Hymenomycetes systematics discussed. References:
Agerer R (1999) Never change a functionally successful
principle: the evolution of Boletales s. l. (Hymenomycetes,
Basidiomycota) as seen from below-ground features.
Sendtnera 6: 5-91. Agerer R (2002) Rhizomorph structures
confirm the relationship between Lycoperdales and
Agaricaceae (Hymenomycetes, Basidiomycota). Nova
Hedwigia (subm.) Hahn C, Agerer R, Wanner G (2001)
Anatomische und ultrastrukturelle Analyse von
Ramaricium ochraceoalbum, einer seltenen Art der
Gomphales und seine verwandtschaftliche Beziehung zu
Geastrum und Gautieria. Hoppea 61: 115-125.
623 - Preliminary results in assessing phylogenetic and
biogeographic relationships among species of Russula
subgenus Ingratula
R. Aldana-Gomez 1* , G.M. Mueller 1 & B. Buyck 2
1 Department of Botany. The Field Museum of Natural
History, 1400 S. Lake Shore Dr. Chicago, IL 60605-2496,
U.S.A. - 2 Laboratoire de Cryptogamie. Museum National
d'Histoire Naturelle, 12 rue Buffon, 75005 Paris, France. -
E-mail: raldanagomez@fmnh.org
Phylogenetic and biogeographic relationships among
species of Russula subgenus Ingratula are being studied
using partial nuclear Ribosomal DNA Large Subunit
(rnDNA LSU) and the complete Internal Transcribed
Spacer region (ITS1, ITS2 and 5.8S rDNA gene). Species
of Russula subgenus Ingratula are macromorphologically
characterized by the tuberculate-striate margin of the
pileus, the brownish-yellow extracellular pigments and the
often disagreable or pronounced smell.
Micromorphological characters vary broadly between
groups of species. Based on these morphological features,
species in this subgenus have been grouped into several
sections and series, but their phylogenetic relationships had
not been evaluated. Phylogenetic analyses of 35 LSU and
ITS sequences, respectively, are being performed using
Maximum Parsimony, Maximum Likelihood and Bayesian
methods. The distinction between sections and between
series is not supported in preliminary analyses. Species in
the subsection Foetentinae are scattered in the cladogram,
while species in section Subvelatae fall within two separate
and unrelated clades. Sister taxon relationships for some
taxa are suggested, e.g. neotropical R. arcyospora and
cosmopolitan R. laurocerasi, American R. pulverulenta and
European R. insignis. Test of Congruence for the
combinability of the two data set together with sequencing
of additional genes and additional taxon sampling are
ongoing.
624 - The 'Torula' infections on Cetraria spp.
V. Alstrup
Botanical Museum, University of Copenhagen,
Gothersgade 130, DK 1123 Copenhagen K, Denmark. - Email:
vagna@bot.ku.dk
The so-called sorediate forms of the lichen genus Cetraria
was revised and found to be pathogenic conditions caused
by parasitic hyphomycetes of which only one species had
been formally described. The new genus Erichseniomyces
with the type species E. sorediella comb. et stat. nov. and
E. islandica sp. nov. are described as are the new species
Trimmatostroma ahlneri and T. danica.
625 - Locating the position of the Micareaceae within
the Lecanorales (lichenized Ascomycota)
H.L. Andersen
Department of Botany, University of Bergen, Allégaten 41,
5007 Bergen, Norway. - E-mail:
heidi.andersen@bot.uib.no
The phylogeny of the Micareaceae and the genus Micarea
Fr. was studied using 39 nuclear small subunit ribosomal
DNA sequences, of which four were new. Phylogenetic
analyses using maximum parsimony, maximum likelihood,
and Bayesian inference were carried out. These resulted in
18 most parsimonious trees, of which one was
corresponding to the 50% majority rule consensus tree
from the Bayesian inference. The maximum likelihood tree
was identical except for one collapsed branch. In all trees,
Micarea adnata and Byssoloma leucoblepharum formed a
strongly supported group. This study supports the
placement of the Micareaceae together with the
Pilocarpaceae inside the Lecanorales, as a sistergroup to
the Bacidiaceae. Several null hypotheses concerning
monophyly were tested: the monophyly of the family
Micareaceae in the sense of Eriksson & Hawksworth, and
Book of Abstracts 189