PROF. SYED QAISER ABBAS
EX-Chairman Department of
Botany
GC University, Faisalabad
Identification of Some Common Genera
of Coelomycetes
Basis
of identification

CONIDIOMATAL STRUCTURES

CONIDIA & CONIDIOGENESIS
CONIDIOMATAL STRUCTURES
(Six variants morphological types)
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Phoma-type (Conidiomata Pycnidial, dark colored, leathery to
carbonaceous, stromatic or non-stromatic pycnidia generally with a
circular ostiole)
Zythia (Nectria)-type (Conidiomata Pycnidial as in Phomatype, but light colored, and sometimes waxy)
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Leptostroma-type (Conidiomata shield-shaped)
Discella-type (Conidiomata more or less cup shaped)
Pycnothyrial Type (Conidiomata pycnothyrium)
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Eustomata Type (Conidiomata Eustomatic, Multilocular of
–
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complex structure of different shapes)
Types of Conidiomata

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Hyphal: Conidia are formed on hyphae.
Sporodochial: Conidiophore aggregate in a manner that they
formed a cushion-like structure.
Synnemata: The conidiophores aggregate in a manner that
they are forming a bundle of sticks-like structure.
Acervulus: The conidiophores are formed on saucer-like
structure.
Pycnidium: The conidia and conidiophore are formed in closed
unilocular body.
Eustromata: The conidiomata are multilocular and conidia are
formed inside the body.
Conidiogenesis:
A process of conidia formation.

Three types(Hennbert and Sutton, 1994)

Blastic:

Thallic: (Septa formed first then conidia mature)
Thalloblastic: (Intermediary between Blastic and Thallic

(Conidia mature first then septa
formation occurs)
conidiogenesis, Conidiogenous cells
slightly increase in shape and size then
septa formation occur, afterward
maturation of conidia occurs)
Conidiogenesis:
Conidia Formation in relation to wall



Hologenous: Conidial wall formed by two layer of
conidiogenous cells
Enterogenous: Conidial wall formed by only inner
wall of conidiogenous cells which forms the outer
wall of the conidia and inner wall of conidia formed,
from the conidial cell contents
Endogenous: Conidial wall of conidia formed by
cytoplasmic content of cell or structure where they
are formed.
Conidia Formation in relation to wall
Process of Conidiogenesis
(Involves Five Steps)
1:- Initiations: first step in conidiogenesis, enzymes involved in
wall building become very active and according to conidial
development pattern, apical wall building material or lateral wall
building materials becoming available and increase in size and
in shape become evident.
2:- Maturation: Conidia acquire their full shape and size.
3:- Delimitation: Conidia are separated by septa formation.
However, this depends upon thallic, blastic or thalloblastic type
of conidiogenesis when it has to be formed.
Process of Conidiogenesis
4:- Seccession: Separation of
conidia from conidiogenous
cell.

Schizolytic: Separation of
conidia occurs by two pile
septum in a way that conidia
and conidiogenous cells both
have half part of septum

Rhexolytic: conidia separate
from conidiogenous cells in a
way that both part remain
attached to conidia hence
conidiogenous cell splits just
below the septum, which
separate conidia and
conidiogenous cell.
Process of Conidiogenesis
5:- Proliferation, or successive development of conidial loci
 Generally only a single conidium is produced at a locus,
however, in many cases a number of conidia are produced
simultaneously or successively at newly developing loci .The
process is called proliferation and of three types.
1 Progressive proliferation: Length of conidiogenous cells
increases.
2 Stationary proliferation: Length of conidiogenous cells does not
increases.
3 Retrogressive proliferation Length of conidiogenous cells
decreases.
Process of Conidiogenesis
Identification of Some Common Genera
of Coelomycetes
1 Coniothyrium Cde.
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Conidiomata …………Pycnidial
Conidiophore …………… Absent.
Conidiogenous cell………Blastic,hologenous
and progressive.
Conidia………………… Unseptate,brown and
not enclosed in a mucilaginous
sheath.
Coniothyrium Cde.
Sphaeropsis Sacc.
Conidiomata …………Pycnidial
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–
Conidiophore ………… Absent
Conidiogenous cell………Blastic,hologenous,
non-proliferating but
some time with one
proliferation
Conidia………………… Unseptate, brown to
black not enclosed in
a mucilaginous
sheath.
Sphaeropsis Sacc.
Microsphaeropsis Hohn
–
–
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Conidiomata …………Pycnidial
Conidiophore …………… Absent
Conidiogenous cell……… Blastic, enterogenous
and stationary
Conidia……………………Unseptate, brown to
black not enclosed in
a mucilaginous
sheath.
Microsphaeropsis Hohn
Avetteae Petrak & Syd.
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Conidiomata …………Pycnidial to eustromatic
Conidiophore …………… Absent or rearly of 1-3
celled.
Conidiogenous cell………Blastic, hologenous
and progressive.
Conidia…………………Unseptate, brown to
black and enclosed in
a mucilaginous
sheath.
Avetteae Petrak & Syd.
Phoma Sacc.
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Conidiomata …………Pycnidial
Conidiophore ……………Absent are rarely of
one celled.
Conidiogenous cell………Blastic, enterogenous
and stationary
Conidia…………………Unicellular hyaline and
non enclosed in
mucilagenous
sheath
Phoma Sacc
Phyllosticta Desm.
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Conidiomata …………Pycnidial
Conidiophore ……………Absent are rarely of
one celled.
Conidiogenous cell……Non proliferating and,
some time proliferate
enterogenous and stationarly
Conidia…………………Unseptate, hyaline enclosed in
mucilagenous sheath
Phyllosticta Desm.
Ascochyta Lib.
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Conidiomata …………Pycnidial
Conidiophore ……………Absent
Conidiogenous cell…… Enterogenous and
stationary
Conidia……………… Uniseptate and hyaline
Ascochyta Lib.
Diplodia Fr.
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Conidiomata ……… Pycnidial
Conidiophore ………… Branched and septate
about and
unbranched
cylindrical at the base
Conidiogenous cell……Blastic, hologenous and
non proliferating
Conidia……………………1 septate, septa transverse and
brown to black
Diplodia Fr.
Hendersonia Berk.
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Conidiomata …………Pycnidial
Conidiophore …………… Absent are rarely of
one celled.
Conidiogenous cell……… Blastic, hologenous
and prograssive.
Conidia………………… Multiseptate, septa
transverse and brown
with out appendages
Urohendersonia Speg. (Fig. 15)
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Conidiomata …………Pycnidial
Conidiophore ……………Absent are rarely of
one celled.
Conidiogenous cell…… .Blastic, hologenous
and prograssive.
Conidia…………………Multiseptate, septa
transvers and brown
with one apical
appendage
Urohendersonia Speg.
Seimatosporiopsis Sutton,Ghaffar &
Abbas.
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Conidiomata ……… Pycnidial to eustromatic
Conidiophore ………… Absent
Conidiogenous cell…… Blastic, hologenous
and prograssive.
Conidia………………… Multiseptate with 3-4
transvers septa and
brown with one apical
and basal appendage
Seimatosporiopsis Sutton,Ghaffar &
Abbas.
Camarosporium Schulz.
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Conidiomata …………Pycnidial
Conidiophore ……………Absent
Conidiogenous cell…… Blastic, hologenous
and prograssive.
Conidia………………… Multiseptate, muriform,
brown
Camarosporium Schulz.