Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
796 - Species of the genus Macentina Vezda
(Ascomycota, Verrucariaceae) as tertiary relicts of the
lichen flora Ukraine
S.D. Zelenko
M.H. Kholodny Institute of Botany, Tereshchenkivska str.
2, 01601 Kiev, Ukraine. - E-mail: skondr@botan.kiev.ua
Natural ranges of the lichens of the genus Macentina are
concentrated in two distribution centers. The first center is
located in tropical forests of Africa, where the folicolous
Macentina species are growing. The second center is
located in Europe and includes corticolous species. M.
dictyospora is known from Sweden, Spain, Switzerland,
the Czech Republic, Slovakia, and Ukraine. M. abscondita
was registered in Great Britain, Austria, and Ukraine. M.
stigonemoides is reported from Great Britain, France,
Spain, Belgium, and Sweden. The natural habitats of
corticolous species of the genus Macentina are connected
with suboceanic and mountane regions of Europe. It gives
evidence that Macentina species prefer humid habitats. In
Ukraine, species of the genus Macentina are known from
the Dniper and Podolia heights. These geomorphological
structures have never been covered by glaciers during the
Quarternary, and thus acted as refugia for species of forest
vegetation, and the Tertiary flora as well. European species
of the genus Macentina are corticolous lichens, they
probably were widespread in broad-leaved forests during
the Neogene. In our opinion, species of the genus
Macentina are Tertiary relicts of the lichen flora of
Ukraine. This conclusion is based on the analysis of their
geographic distribution, ecology of Macentina species, and
data of geological and palaeobotanical studies.
797 - Gibberella konza, a new species from prairie
grasses
K.A. Zeller 1 , B.A. Summerell 2* , J.F. Leslie 1 & S. Bullock 2
1 Kansas State University, Manhattan, Kansas, U.S.A. -
2 Royal Botanic Gardens, Sydney, Australia.
The Gibberella fujikuroi species complex (Fusarium
section Liseola and allied taxa) is composed of an
increasingly large number of morphological, biological,
and phylogenetic species. Most of the known species in
this group have been isolated from agricultural ecosystems,
or have been described from only a small number of
isolates. We have been sampling Fusarium communities
from native prairie grasses in Kansas and have recovered a
large number of isolates that superficially resemble F.
anthophilum. We have used a combination of
morphological, biological, and molecular characters to
describe a new biological species, Gibberella konza
(Gibberella fujikuroi mating population I [MP-I]), from
native prairie grasses in Kansas. Although female fertility
for field isolates of this species appears to be low, G. konza
is heterothallic, and we have generated reliably female
fertile mating population tester strains for this biological
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Book of Abstracts
species. The F. konzum anamorph is differentiated from F.
anthophilum and from other Fusarium species in section
Liseola by mating compatibility, morphology, AFLP
fingerprint profile, and the DNA sequence of the ß-tubulin
gene.
798 - Floristic composition of rust fungi in Tibetian
Everest Himalaya
J.Y. Zhuang
Institute of Microbiology, Academia Sinica, P.O. Box 2714,
Beijing 100080, China. - E-mail: zhuangjy@sun.im.ac.cn
The rust flora of Tibetan Everest Himalaya mainly consists
of temperate genera and species. Among the 22 known
genera (excluding form genera), Puccinia, Uromyces and
Phragmidium are cosmopolitan; Chrysomyxa,
Coleosporium, Cronartium, Gymnosporangium,
Hyalopsora, Melampsora, Melampsoridium,
Pucciniastrum, Thekopsora and Uredinopsis are mainly
north temperate; Blastospora, Miyagia and Pucciniostele
are typically eastern Asian; Endophyllum, Phakopsora,
Physopella, Pileolaria, Ravenelia and Trochodium are
tropical. Of the 155 known species, 20 (sharing 13% of the
total) are endemic in Himalaya. Apart from cosmopolitan
species (12%) and species restricted to China (3%) and
Himalaya, the predominant floral elements are eastern
Asian (27%), northern temperate (20%) and Old World
temperate (8%). Nine species (6%) are disjunctive between
eastern Asia and North America. No typical Central Asian
species is found. The arid and frigid plateau steppe and
desert in northern Tibet impede intermigration of rusts,
resulting in the separation of the rust flora from that of
Central Asia. Only about 10% of the total known species
are tropical in affinities with the majority of these (8%)
identifiable with species of general distribution in Indo-
Malaysia. The lower percentage of tropical species
suggests that the connexion between the rust flora and that
of the tropics seems weak.