Lactarius omphaliformis Romagn. + Alnus

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Literature

• references
  Pritsch K, Becerra A, Polme S, Tedersoo L, Schloter M, Agerer R (2010) Description and identification of Alnus acuminata ectomycorrhizae from Argentinean alder stands. Mycologia 102(6): 1263-1273

Morphology

Morphology of the mycorrhizal system
• length
0 mm    Lower value of unspecified range (could be µ-s.d., but not known)
18 mm    Upper value of unspecified range (could be µ+s.d., but not known)
• ramification presence-type
  monopodial-pinnate
or    monopodial-pyramidal
• ramification orders
0     Lower value of unspecified range (could be µ-s.d., but not known)
2     Upper value of unspecified range (could be µ+s.d., but not known)
• abundance
  solitary or in small numbers
• rhizomorphs as stout, short, conical structures presence-abundance
  absent
• rhizomorphs as short mycorrhiza-like outgrowths with blunt tips presence
  absent
• rhizomorphs presence
  absent
• exploration type
  contact
Morphology of the unramified ends
• shape
  bent
or    sinuous [almost]
• shape {of distal end}
  not inflated, cylindric
• length
0 mm    Lower value of unspecified range (could be µ-s.d., but not known)
15 mm    Upper value of unspecified range (could be µ+s.d., but not known)
• diameter
0.2 mm    Lower value of unspecified range (could be µ-s.d., but not known)
0.4 mm    Upper value of unspecified range (could be µ+s.d., but not known)
• colour
  ochre, yellowish brown
or    orange
• very tip colour
  yellowish
• older parts colour
  brown
• mantle cortical cells visibility
  not visible
• mantle {distinct} surface visibility
  present
• mantle transparency
  not transparent
• mantle dots presence-colour
  absent
• mantle carbonizing presence
  absent
• mantle surface {in general} habit
  smooth
or    covered with soil particles
• emanating hyphae presence
  present
• emanating hyphae abundance
  infrequent
Morphology of sclerotia
• presence
  absent

Anatomy

Anatomical features of the entire mycorrhiza
• emanating elements presence-type
  emanating hyphae
• crystals presence
  absent
• blue granules presence
  absent
Anatomy of laticifers
• presence
  present
• anatomy entire mycorrhiza laticiferous solitary (gloeoplerous) cells presence
  present
Anatomical features of the mantle
• completeness
  complete
• matrix presence
  absent
Anatomy of the outer mantle layer apart from the ectormycorrhizal tip
• organisation
  pseudoparenchymatous
• organisation {if pseudoparenchymatous} cell shape
  epidermoid, puzzle-like, jig-saw-shaped
• mantle type
  epidermoid cells bearing a hyphal net (type Q)
• hyphal net cells shape
  not specialized
• hyphal net cell walls habit
  faint, delicate, inconspicuous, rather thin
• hyphal net clamps presence
  absent
• clavate end cell cover presence
  absent
• hyphae arrangement
  not specific
• hyphae sticky matrix on hyphal surface presence
  present
• septa thickness {relative to cell walls}
  as thick as walls
• septa clamps presence
  absent
• cell pigment location-colour
  membranaceously yellowish
• cell contents presence-kind
  needle-like [after fixation]
• cell diameter
6 µm    Lower value of unspecified range (could be µ-s.d., but not known)
20 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• cell length
7 µm    Lower value of unspecified range (could be µ-s.d., but not known)
34 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• cell wall thickness
0.3 µm    Lower value of unspecified range (could be µ-s.d., but not known)
0.5 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• cell wall surface habit
  smooth
• drops of exuded pigment presence
  absent
• roundish plasmatically yellow cells presence
  absent
• pigment granula on surface presence
  absent
Anatomy of the middle mantle layer
• presence
  absent
Anatomy of the inner mantle layer
• organisation
  plectenchymatous
• hyphae arrangement
  without pattern
• hyphae vessel-like presence
  absent
• septa clamps presence
  absent
• cell pigment location-colour
  membranaceously yellowish
• cell diameter
2 µm    Lower value of unspecified range (could be µ-s.d., but not known)
3 µm    Upper value of unspecified range (could be µ+s.d., but not known)
Anatomy of the mantle in longitudinal section
• mantle thickness {apart from tip}
44 µm    Lower value of unspecified range (could be µ-s.d., but not known)
58 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• mantle different layers presence
  discernable
• outer mantle layer organisation
  pseudoparenchymatous
• outer mantle layer hyphae tangentially length
6.5 µm    Lower value of unspecified range (could be µ-s.d., but not known)
18 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• outer mantle layer hyphae radially diameter
3 µm    Lower value of unspecified range (could be µ-s.d., but not known)
8 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• middle mantle layer presence
  absent
• inner mantle layer organisation
  plectenchymatous
• inner mantle layer hyphae tangentially length
3 µm    Lower value of unspecified range (could be µ-s.d., but not known)
10 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• inner mantle layer hyphae radially diameter
1.5 µm    Lower value of unspecified range (could be µ-s.d., but not known)
6.5 µm    Upper value of unspecified range (could be µ+s.d., but not known)

Anatomy of the tannin cells in longitudinal section
• presence
  absent

Anatomy of the cortical cells in longitudinal section
• anatomy mantle longitudinal section cortical (epidermal) cells shape
  rectangular
• anatomy mantle longitudinal section cortical (epidermal) cells tangentially length
13 µm    Lower value of unspecified range (could be µ-s.d., but not known)
35 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• anatomy mantle longitudinal section cortical (epidermal) cells radially diameter
9.5 µm    Lower value of unspecified range (could be µ-s.d., but not known)
21 µm    Upper value of unspecified range (could be µ+s.d., but not known)

Anatomy of the Hartig net in longitudinal section
• presence
  present
• kind
  paraepidermal
• structure {in plan view}
  infrequently lobed
• lobes width
2.4 µm    Lower value of unspecified range (could be µ-s.d., but not known)
5 µm    Upper value of unspecified range (could be µ+s.d., but not known)
Anatomy of the mantle in cross-section



Anatomy of the emanating elements in general
• backwards-oriented clamps presence
  absent
Anatomy of cystidia


Anatomy of emanating hyphae
• shape
  wavy
or    not striking
• cell pigment location-colour
  absent
or    membranaceously yellowish
• drops of exuded pigment presence
  absent


Anatomy of the septa of emanating hyphae
• clamps presence
  absent


Anatomy of the cells of emanating hyphae
• anatomy emanating elements emanating hyphae cell shape {at distal end}
  simple
• anatomy emanating elements emanating hyphae cell diameter
1.5 µm    Lower value of unspecified range (could be µ-s.d., but not known)
3 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• anatomy emanating elements emanating hyphae cell length
4 µm    Lower value of unspecified range (could be µ-s.d., but not known)
18 µm    Upper value of unspecified range (could be µ+s.d., but not known)
• anatomy emanating elements emanating hyphae cell wall surface habit
  smooth
• anatomy emanating elements emanating hyphae cell wall thickness
0.2 µm    Lower value of unspecified range (could be µ-s.d., but not known)
0.4 µm    Upper value of unspecified range (could be µ+s.d., but not known)


Anatomy of rhizomorphs

Anatomy of hyphae in rhizomorphs
Anatomy of chlamydospores
• presence
  absent
Anatomy of haustoria
• {of ectomycorrhiza former} presence
  absent
• {of foreign origin} presence
  absent

Chemical reactions

• reaction with cotton-blue-lactic-acid presence
  present [emanating hyphae and laticifers slightly blue]
• reaction with ethanol 70% presence
  present [whole ECM black]
• reaction with KOH 10% presence
  absent [whole ECM with KOH 15% ochre-brown]
• reaction with lactic acid presence
  present [whole ECM bleaching]
• reaction with Melzer's reagent presence
  absent
• reaction with NH4OH
  absent
• reaction with sulpho-vanillin presence
  present [walls pink, contents of mantle cells with droplets, laticifers black]

Ecology

• geographic occurrence continent
  South America

Tree

• plant family
  Betulaceae
• plant genus
  Alnus

Fungus

• family
  Russulaceae
• fruitbodies growth habit
  epigeous

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