Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
785 - Phylogeny of the Gymnopus/Marasmiellus group
based on 28s nrDNA sequence
A.W. Wilson * & D.E. Desjardin
Department of Biology, San Francisco State University,
1600 Holloway Ave. San Francisco, CA 94132, U.S.A. - Email:
andson@sfsu.edu
Nuclear ribosomal large subunit sequence was collected for
89 taxa representing members of the
Gymnopus/Marasmiellus group, referred to as the
Lentinula clade in Moncalvo et al. (2002). Tissue was
extracted from ^70 specimens via PCR and cycle
sequencing reactions. The remaining sequences were
obtained from GenBank or the fore-mentioned authors.
Sequence was aligned and phylogenetic analyses were
performed using PAUP. Several methods of phylogenetic
analysis were utilized including weighted parsimony,
maximum likelihood and neighbor joining. Bootstrap
values were used to indicate structural soundness of groups
represented in the tree. The aim of this study is to gather
molecular evidence that will help define groups within the
Gymnopus/Marasmiellus cluster that have been
traditionally recognized using morphological taxonomy.
786 - Developmental similarities in Echinosporangium
transversale and Mortierella multidivaricata. Early
maturity hypothesis
M. Wrzosek
Warsaw University, Aleje Ujazdowskie 4, 02-634, Warsaw,
Poland. - E-mail: mwrzosek@ulmus.bot.uw.edu.pl
Mortierella multidivaricata and Echinosporangium
transversale are related genera, and there are classified in
the family Mortierellaceae, ordo Mortierellales (Voigt,
Wostemeyer 2001). There are two basic features common
for both genera and other species of the family
Mortierellaceae -the presence of anastomoses between
hyphae and the lack of the columellae. The main
substantial difference concerns the morphology of the
sporangia. Echinosporangium has non-typical sporangium
of sausagous shape with spiny ends while sporangia of
Mortierella multidivaricata are globose. Phylogenetical
study (my PhD. thesis, 2000, Voigt and Wostemeyer 2001)
confirm close affinity of both genera. Echinosporangium is
located in phylogenetical tree within genus Mortierella.
Are there any in vivo observations which can help us in
understanding on one hand the phylogenetic affinity
resulting from molecular methods and on the other
morphological dissimilarities between sporangia? Close
similarities in early ontogenetical development of asexual
structures in Mortierella multidivaricata and
Echinosporangium transversale were observed. The
differences appear at the moment of the spores formation.
Taking into account these observations and the results of
molecular studies, we may propose the following
hypothesis: Small numbers of mutations placed in genes
for regulation of sporangium development could result in
apparent morphological changes in asexual structures of
Echinosporangium.
787 - Peniophora in Taiwan with simple-septate hyphae
S.H. Wu
National Museum of Natural Science, Taichung, Taiwan
404, Taiwan. - E-mail: shwu@mail.nmns.edu.tw
In this survey of Taiwanian Peniophora species with
simple-septate hyphae five species are presented: P.
bicornis, P. borbonica, P. maliensis, P. reidii, and P.
taiwanensis. The former four species are newly recorded
from Taiwan, and the last one is new to science.
Description and line drawing are given for each species.
Cultural and cytological studies are also provided for the
five species.
788 - Diversity of Sporidesmium and related fungi in
China
W.P. Wu * & Y. Zhang
RD China, Novozymes China, 22 Xinxi Zhong Lu, Shangdi
Zone, Haidian District, Beijing 100085, China. - E-mail:
WUWP@novozymes.com
The Sporidesmium-Endophragmiella complex includes
dematiaceous hyphomycetes which holoblastically produce
phragmosporae. This group of fungi is mostly found on
dead branches or rotting wood. Only one species from
literatures was known in China. However, this study
showed that they widely distribute in China and a total of
147 species in 23 genera have been identified, including 37
new species and 14 new combinations. All species have
been fully described and illustrated based on Chinese
specimens.
789 - Revision of the genus Septoriella Oudem.
(Coelomycetes)
W.P. Wu 1* , B.C. Sutton 2 & Y. Zhang 1
1 RD China, Novozymes China, 22 Xinxi Zhong Lu, Shangdi
Zone, Haidian District, Beijing 100085, China. - 2 Apple
Tree Cottage, Black Heaph, Wenhaston, Near Halesworth,
IP90 9HD, U.K. - E-mail: WuWP@novozymes.com
A revision of the coelomycete genus Septoriella Oudem. is
made and 14 species are accepted. Among them, 5 are new
species, S. fusiformis sp. nov., S. hendersoniae sp. nov., S.
intermedia sp. nov., S. latispora sp. nov., and S. petrakii sp.
nov.; and two are new combinations, S. mastigospora
(Petr.) comb. nov. (syn. Urohendersoniella mastigospora
Book of Abstracts 237