Mycology Lab Exam

What are agarics?

The typical mushroom, has a gilled cap that is distinct from the stipe

When does mycelia turn into a fruiting body?

When conditions such as high humidity and oxygen are right

What is the egg shaped bundle of mycelium called?

a button

What is the universal veil?

protective membrane that the cap tears through

What is the specking on the cap called?

scales

What is the base of the mushroom called?

volva

What is the partial veil?

protective membrane covering gills

What are the remnants of the partial veil called?

The annulus

Why are you able to cut out a clean section of the hyphae from the leading edge?

Because hyphae often outrun bacterial or yeast contaminants on the plate

What are 3 methods for decontaminating a fungal culture?

1. transferring clean fungal cells to a new plate

2. pour almost cooled agar on top of contaminated dish (traps contaminants but allows hyphae to grow)

3. add antibiotics to the medium when you are pouring it

What are slime molds?

not molds, not fungi. We don’t really know, show features from across taxonomic groups

What is the difference between plasmodial and cellular slime molds?

Plasmodial slime molds have a singular massive cells that keeps dividing without cell division but a cellular slime mold has individual cells that aggregate and form a slug

How do plasmodial slime molds sense and eat their food?

chemotaxis and phagocytosis (and pinocytosis by excreting enzymes)

When do plasmodial slime molds produce sporangia?

Under stress (not enough food) and exposed to light

Are plasmodia haploid or diploid?

Diploid

How does plasmodial slime mold life start?

As a single nucleated amoeba

What happens before an amoeba undergoes cell division?

It undergoes mitosis

What two forms does the plamodial slime mold’s amoeba chage back and forth betwen?

a hard, protective cyst (if environment isn’t friendly) or a flagellate (if there is enough water)

What form does Poly take if she is starving but doesn’t have light?

She forms a sclerotium

What are pseudopodia?

extensions of the cytoplasm that search for food