Introduction to Fungi, Third Edition

606 HETEROBASIDIOMYCETES
Fig 21.10 Ultrastructure of Tremellales. (a) Cupulate parenthesome and dolipore septum of T. globospora.(b,c)Tipofthe
haustorial filament of Trimorphomyces papilionaceus (top) which has made contact with a hypha of its host, Arthrinium
sphaerospermum (bottom). Membrane continuity has been established in the micropore region (c).Original prints kindly provided
by M.L.Berbee (a) and R.Bauer (b,c). a reprinted from Berbee and Wells (1988), with permission from Mycologia. ßThe Mycological
Society of America.
Fig 21.11 Tremella mesenterica. (a) Haustorial branch.
The swollen dikaryotic branch arises from a clamp
connection and emits filaments which may contact
host hyphae. (b) Dikaryotic clamped hypha from the
hymenium of a fruit body. One branch has produced
a basidium whereas the other has formed dikaryotic
conidia. Redrawn from Wells and Bandoni (2001) with
kind permission of Springer Science and Business
Media.
to the basidiospore. These buds act as conidiogenous
cells by producing numerous minute
blastoconidia, which in turn germinate by swelling
and budding to give rise to the haploid yeast
state. Fusion between compatible yeast cells
re-establishes the dikaryotic mycelial phase.
In addition to producing basidia, hyphae in the
fruit body may also form a dikaryotic conidial