PROF. SYED QAISER ABBAS EX-Chairman Department of Botany GC University, Faisalabad

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IDENTIFICATION OF SOME COMMON GENERA OF
COELOMYCETES

• PROF. SYED QAISER ABBASEX-Chairman Department of
  BotanyGC University, Faisalabad

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Identification of Some Common Genera of
Coelomycetes

• Basis of identification
• CONIDIOMATAL STRUCTURES
• CONIDIA CONIDIOGENESIS

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CONIDIOMATAL STRUCTURES (Six variants
morphological types)

• 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 Phoma-type, but light colored, and sometimes
  waxy)
• Leptostroma-type (Conidiomata shield-shaped)
• Discella-type (Conidiomata more or less cup
  shaped)
• Pycnothyrial Type (Conidiomata pycnothyrium)
• Eustomata Type (Conidiomata Eustomatic,
  Multilocular of complex structure of different
  shapes)

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Types of Conidiomata

• 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.

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Conidiogenesis

• A process of conidia formation.
• Three types(Hennbert and Sutton, 1994)
• Blastic (Conidia mature first then septa
  formation occurs)
• Thallic (Septa formed first then conidia mature)
• Thalloblastic (Intermediary between Blastic and
  Thallic conidiogenesis, Conidiogenous cells
  slightly increase in shape and size then
  septa formation occur, afterward
  maturation of conidia occurs)

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Conidiogenesis
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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.

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Conidia Formation in relation to wall
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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.

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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.

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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.

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Process of Conidiogenesis
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Identification of Some Common Genera of
Coelomycetes

• 1 Coniothyrium Cde.
• Conidiomata Pycnidial
• Conidiophore Absent.
• Conidiogenous cellBlastic,hologenous and
  progressive.
• Conidia Unseptate,brown and not
  enclosed in a mucilaginous sheath.

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Coniothyrium Cde.
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Sphaeropsis Sacc.

• Conidiomata Pycnidial
• Conidiophore Absent
• Conidiogenous cellBlastic,hologenous,
  non-proliferating but some time with
  one proliferation
• Conidia Unseptate, brown to
  black not enclosed in a mucilaginous
  sheath.

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Sphaeropsis Sacc.
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Microsphaeropsis Hohn

• Conidiomata Pycnidial
• Conidiophore Absent
• Conidiogenous cell Blastic, enterogenous
  and stationary
• ConidiaUnseptate, brown to black
  not enclosed in a mucilaginous sheath.

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Microsphaeropsis Hohn
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Avetteae Petrak Syd.

• Conidiomata Pycnidial to eustromatic
• Conidiophore Absent or rearly of 1-3
  celled.
• Conidiogenous cellBlastic, hologenous
  and progressive.
• ConidiaUnseptate, brown to black and
  enclosed in a mucilaginous sheath.

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Avetteae Petrak Syd.
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Phoma Sacc.

• Conidiomata Pycnidial
• Conidiophore Absent are rarely of one
  celled.
• Conidiogenous cellBlastic, enterogenous
  and stationary
• ConidiaUnicellular hyaline and non
  enclosed in mucilagenous
  sheath

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Phoma Sacc
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Phyllosticta Desm.

• Conidiomata Pycnidial
• Conidiophore Absent are rarely of one
  celled.
• Conidiogenous cellNon proliferating and,
  some time proliferate
  enterogenous and stationarly
• ConidiaUnseptate, hyaline enclosed in
  mucilagenous sheath

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Phyllosticta Desm.
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Ascochyta Lib.

• Conidiomata Pycnidial
• Conidiophore Absent
• Conidiogenous cell Enterogenous and
  stationary
• Conidia Uniseptate and hyaline

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Ascochyta Lib.
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Diplodia Fr.

• Conidiomata Pycnidial
• Conidiophore Branched and septate
  about and unbranched
  cylindrical at the base
• Conidiogenous cellBlastic, hologenous and
  non proliferating
• Conidia1 septate, septa transverse and
  brown to black

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Diplodia Fr.
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Hendersonia Berk.

• Conidiomata Pycnidial
• Conidiophore Absent are rarely of one
  celled.
• Conidiogenous cell Blastic, hologenous
  and prograssive.
• Conidia Multiseptate, septa
  transverse and brown with out
  appendages

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Urohendersonia Speg. (Fig. 15)

• Conidiomata Pycnidial
• Conidiophore Absent are rarely of one
  celled.
• Conidiogenous cell .Blastic, hologenous
  and prograssive.
• ConidiaMultiseptate, septa transvers
  and brown with one apical appendage

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Urohendersonia Speg.
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Seimatosporiopsis Sutton,Ghaffar Abbas.

• 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

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Seimatosporiopsis Sutton,Ghaffar Abbas.
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Camarosporium Schulz.

• Conidiomata Pycnidial
• Conidiophore Absent
• Conidiogenous cell Blastic, hologenous
  and prograssive.
• Conidia Multiseptate, muriform,
  brown

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Camarosporium Schulz.
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Thanks for Sparing Your Precious
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Best wishes for a Rewarding Career in

• Mycology Plant Pathology