Key Number 1, Fungal Hyphae

Hyphae without cross wall (septa)

Hyphae with cross wall (septa)

  • Hyphae branched at right angles, with constrictions at branch origins; uniform hyphal diameter(Rhizoctonia spp.)
  • Hyphae branch in Y’s; non-uniform hyphal diameter (Sclerotinia spp.)*useful only to distinguish from Rhizoctonia spp.
  • Hyphae with clamp connections(Typhula spp.)

    *look for small, dark sclerotia embedded in infected tissue

    (Limonomyces roseipellis)

    *Look for cottony pink mycellium on infected patches of turf)

  • (Basidiomycetes) Most of the fairy ring fungi*Look for white mycellium in the soil or thatch at the outer edge of rings
Hyphae w/out Crosswalls
Hyphae w/out Crosswalls
Hyphae Crosswalls and 90° Branching
Hyphae Crosswalls and 90° Branching
Hyphae Crosswalls and Y-Branching
Hyphae Crosswalls and Y-Branching
Hyphae w/ Clamp Connections
Hyphae w/ Clamp Connections
HyphaeSclerotiaEmbeddedinLeafTissue
Sclerotia Embedded in Leaf Tissue