Introduction to Mycology Flashcards
Human disease caused by a fungus
Mycosis/ mycoses
sexual reproductive phase of a fungus
Teleomorph
asexual form of the fungus; product of mitosis
Anamorph
having cross walls
Septate
w/o septations
Aseptate
beginning of a true hyphal element
Germ tube
Asexual spores formed by fragmentation of mycelia
onti rectangular, barrel-shaped,or cask-shaped, thick-walled spores.
Arthroconidia
Sexual spores produced in a round sac like ascus that usually contains two to eight ascospores
Ascospores
Asexual conidia produced by formation of conidia by simple budding from mother cells, hyphae, or pseudohyphae; budding si characteristic fo yeasts dna yeastlike fungi.
Blastoconidia
Thick-walled asexual conidia that are formed during unfavorable conditions and germinate when environment improves; greater in diameter than hyphae and may be observed at hyphal tip (terminal), within hyphal strand (intercalary), or on the sides of hyphae (sessile).
Chlamydoconidia
Large, round, multicellular structure that surrounds the asci and ascoporesuntil the structure ruptures, releasing the ascopores.
Cleistothecium
Dome-shaped, swollen sporangiophore tip that extends niot the sporangiophore.
Columella
Specialized, vegetative hyphae that act as stalks on which conidia are found.
Conidiophore
Asexual structures that form on the sides of hyphae or conidiophores; may be produced singly or ingroups; macroconidia are large and multicelled, whereas microconidia are usually smal and unicellular.
Conidia
Spindle-shaped conidium that is wider in the middle and narrows toward either end.
Fusiform
Outgrowth of a conidiumor spore that is the beginning of a hypha; on constriction is observed at the point of attachment. Germ tubes ear usually three to four times the length of the original yeast cel.
Germ tube
Tubelike structures that are the fundamental units of the fungus ; mani hyphae join to form the mycelium, which forms the colony of the fungus.
Hyphae
Flask-shaped ro vase-shaped structure that produces phialoconidia.
Phialide
Chains focells produced by budding that may resemble true hyphae.
Pseudohyphae
constricted at the septa and form branches that begin at the septation.
Pseudohyphae
Mass of pseudohyphae
Pseudomycelium
Pear-shaped conidia
Piriform
Large, round, thick-walled structure that contains spores characteristic of Coccidioides immitis in tissue.
Spherule
Asexual spore contained ni a saclike structure (sporangium) i n which spores are formed and held.
Sporangiospore
With knoblike projections
Tuberculate
Enlarged structure at the end of a conidiophore or sporangiophore that may bear phialides
Vesicle
is branch of Microbiology which deals with the study of fungi, molds and yeasts which are eukaryotic organisms.
Mycology
Fungi have ____________ in its cell wall
Chitin
_________________ in its cell membrane and they ___________
Ergosterol
Lack chlorophyll
2 morphological forms of fungi
Yeast
Mold
Unicellular
Yeast
Reproduce by sexual, asexual or airborne spores
Mold
Grows at room temperature
Mold
Colonies are moist, creamy, opaque and pasty
Yeast
Multicellular
-with tubular filamentous hyphae
Mold
Most reproduce asexually by budding
Yeast
They have similar microscopic and colonial morphology and require physical or biochemical test for identification.
Yeast
Grows at 37’C
Yeast
Colonies are fluffy, cottony, wooly or powdery
Mold
Eight key elements of a typical yeast cell:
Capsule
Cell wall
Cystoplasmic membrane
Bud
Mitochondria
Nucleus
Nuclear membrane
Vacuole
The outer part of the cell wal
Capsule
The protective layer surrounding the cell which gives the cell structure.
Cell wall
The membrane controls the molecules and compounds
that come in and out of the yeast cell
Cystoplasmic membrane
The new “daughter” cell, that eventually splits off from the original “mother” cell.
Bud
The “powerhouse” of the cell where respiration occurs.
Mitochondria
The part of cell containing DNA.
Nucleus
The protective layer around the nucleus that controls flow of material in and out of the nucleus.
Nuclear membrane
The sac inside the cell containing water and other liquids.
Vacuole
the yeasts reproduce asexually by
Blastoconidia formation
the yeasts reproduce sexually by production of
ascospores and basidiospores
are long branched chains of yeast cells with constrictions at the interface of elongated blastoconidia that remain attached after multiplication.
Pseudohyphae
_______________ occurs by the production of multicellular filamentous colonies, which consisting of branching cylinder tubules called _____________
Mold
Hyphae
The mass of hyphae that accumulates during active growth is a
Mycelium
Fungi: Mold
Asexual as well as sexual reproduction can result in the production of
Spores
2 TYPES OF FUNGI
Monomorphic fungi
Dimorphic fungi
one phase only
Monomorphic
Capable of two phases
Dimorphic fungi
Mycelial or mold (filamentous form) at
25 to 30 degrees
Yeast at
37
tissue or invasive phase
Yeast at 37°C ( thermal dimorphism)
inductive to man
Mycelial or mold
microscopic unit of fungi
Hyphae
long, branching filaments
Hyphae
Dark colored
Dermatiaceous
Colorless
Hyaline
Mass or colony of hyphaw
Mycelium
Organized body of hyphae
Fruiting body (e.g mushroom)
intertwining structure composed of tubular filaments known as HYPHAE.
Mycelium
Types of hyphae
Septate hyphae
SPARSELY SEPTATE/ COENOCYTIC HYPHAE (FORMERLY ASEPTATE)
Pseudohyphae
- have cellular separation or cross-walls.
Septate
Diameter of septate hyphae
3 to 6 urn
All fungi has septate hyphae except
Zygomycetes
Continuous, few to no cellular separations or cross-walls
Sparsely septate/ coenocytic hyphae (aseptate)
Diameter of sparsely septate/ coenocytic (aseptate)
5 to 15 urn
Fungi that are aseptate
Zygomycetes (Rhizopus, mucor, absidia)
chain of cells formed by budding that resemble true hyphae.
Pseudohyphae
- differ from true hyphae in that they are constricted at the septa, form branches that begin with septation, and have terminal cells smaller than other cells.
Pseudohyphae
Mycelium is composed of
Vegetative
Aerial
function in food absorption and are the portion that extends below the agar surface or nutrient substrate.
Vegetative
extend above the agar or nutrient substrate, and their function is to support reproductive structures called conidia.
Aerial
heterogeneous molds characterized by a lack of pigmentation of hyphae
Hyaline molds
invasion of tissue by non pigmented hyphae.
Hyalohyphomycosis
MELANIZED/PIGMENTED
Dermatiaceous
Heterogeneous molds characterized by dark pigmentation of hyphae Hundreds of species known to cause disease in humans
Dermatiaceous
invasion of tissue by pigmented hyphae
Phaeohyphomycosis
Fungi that can reproduce both sexually and asexually.
Perfect fungi
Fungi that can reproduce only by asexual means.
Imperfect fungi
What reproduction requires the formation of specialized fungal structures
Sexual reproduction
formation of specialized fungal structures
Spores
Fungi that undergo sexual reproduction are termed
Perfect fungi
Sexual reproduction types of spores
Ascospores
Basidiospores
Oospores
Zygospores
Spores contained in a saclike structure
Ascospores
Spores contained in a club-shaped structure
Basidiospores
Spores resulting from the fusion of cells from two different hyphae
Oospores
Spores resulting from the fusion of two identical hyphae
Zygospores
Only involves division of the nucleus and cytoplasm.
Asexual reproduction
Fungi that undergo asexual reproduction are termed
Imperfect fungi
Imperfect fungi are the only fungal group to produce _______
Conidia
are sporelike asexual reproductive structures not produced by cleavage, conjugation, or free-cell formation.
Conidia
Conidia are only formed by the
Imperfect fungi
Conidia classification is based on conidia morphologic
development.
Microconidia
Macroconidia
are single-celled, small conidia.
Microconidia
are multicellular, large conidia.
Macroconidia