First Lecture Examination, Botany 359, Fall, 1998

I. Definitions. define the following terms, processes, or structures tersely but completely (10 min; 15 pts)

teleomorph

parasexual cycle

Enveloping Membrane System

Woronin Bodies

homogenic incompability

II. Provide an explanation in a diagram of the ploidy number and origin of the paraphyses, hymenium, antheridium and ascogonium, ascogenous hyphae, and ascocarp wall of a fungus in the Discomycetes (10 min; 25 pts). Label All Parts.

III. Compare (give all the similarities) and contrast (give all the differences) for the following pairs of terms, processes, structures or taxa.

an operculate ascus with an inoperculate ascus ( 4 min; 12 pts)

paraphysis, pseudoparaphysis, apical paraphysis, and periphysis (4 min; 4 pts)

Earth tongues (Geoglossaceae, Helotiales, Discomycetes) with Xylaria (Xylariaceae, Xylariales, Pyrenomycetes) (4 min; 8 pts)

an acervulus with an apothecium (2 min, 4 pts)

V. Diagram the life cycle of Ophiostoma ulmi, the causative agent of the Dutch Elm Disease. Be sure to include the Graphium stage and the Sporothrix stage; Make sure you label all parts and discuss all dispersal agents; be sure to include the sexual stages as well. At the end of your discussion include why mycologists now consider this name to be correct rather than that of Ceratocystis ulmi (16 min; 32 pts).