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General information

 Substratum:Terricolous 
 
Continent::
Africa no
North America no
S. and C. America no
 
Asia no
Australia no
Europe yes
 
 Authority:Romagnesi 
 Synonyms and close species:C: R. albonigra ss Singer, Blum, Ricken & Schaeffer 
 Information given by author(s):Compactae nigricantinae
France: 3
Type: Romagnesi 56-62
 
 Host(s):Deciduous (Fagus, Acer), coniferous (Picea ?) 
 Taxon name_Mycobank:
 
 Bibliography:
 

Macro-characters

 
Stipe
 Width of stipe:15 - 25 
 Veil:Absent 
 Form of base of stipe:Not radicate 
 Form of stipe:Infl. at top/base/straight 
 Context of stipe:Partly hollow to solid/both 
 
Main color(s) of stipe::
grey/black yes
brown yes
white yes
yellow/cream no
blue no
 
orange no
red/pink no
purple/vinaceous no
green no
   
 
 Length of stipe:30 - 60 
 
Pileus
 Type of pileipellis:Smooth to squamose or both 
 Striations of pileus:Absent 
 Viscosity of pileus:Never viscid nor viscous 
 Form of center of pileus:Concave/depressed 
 Separability of pileus:Nil (0%) 
 
Thickness of flesh of pileus
 Thickness of flesh of pileus:Thick 
 
Main color(s) of pileus::
grey/black yes
brown yes
white yes
yellow/cream no
blue no
 
orange no
red/pink no
purple/vinaceous no
green no
   
 
 Diameter of pileus:70 - 120 
 
Lamellae
 Spacing of lamellae:Variable 
 Number of lamellulae:More than lamellae 
 Furcation of lamellae:At the stipe/everywhere/absent 
 Color of ridges of lamellae:Fully concolorous with faces 
 Type of lamellar ridges:Entire/smooth 
 
Main color(s) of lamellae::
grey/black yes
brown no
white yes
yellow/cream yes
blue no
 
orange no
red/pink yes
purple/vinaceous yes
green no
   
 
 Height of lamellae:4 - 7 
 Odor:Variable/weak and unpleasant 
 Flavor of flesh:Sweet to bitter or both 
 
Color changes
 Fruit body turns green/blue with age:Not turning green/blue 
 Fruit body turns red if touched/cut:Var./weak reddening of stipe 
 Fruit body turns yellow-brown with age:Not turning yellow-brown 
 Fruit body turns br. yellow if touched:Not turning bright yellow 
 Fruit body turns black with age/touched:Entire fruit body 
 Fruit body turns grey with age:Entire fruit body 
 
Chemical reactions
 FeSO4 test on flesh:No react. to green-grey/weak 
 
Latex
 Latex:Absent 
 
Color(s) of fresh latex::
grey/black no
brown no
white no
yellow/cream no
blue no
 
orange no
red/pink no
purple/vinaceous no
green no
   
 
 
Color(s) of dry latex::
grey/black no
brown no
white no
yellow/cream no
blue no
 
orange no
red/pink no
purple/vinaceous no
green no
   
 

Micro-characters

 
Spores
 Length of spores:7.7 - 9.7 
 Width of spores:6.7 - 8 
 Amyloid plage:Absent 
 Appearance of spores verrucae:Tips round./truncat./cylindr. 
 Ornamentations in surface view:Round basis/irregular/linear 
 Connection(s) between verrucae:Joined by fine and low lines 
 Overall appearance of spores:Partly reticulate 
 Height of verrucae:0 <= x <= 0.5 µm 
 Color of spore deposit:1 
 Pictures from Romagnesi, 1967_Link:
  • 3\24a.jpg
  • 3\24b.jpg
 
 
Basidia
 Length of basidia:43 - 65 (72) 
 Width of basidia:7 - 10.7 (11.5) 
 Number of sterigmata per basidium:Four 
 
Pleurocystidia
 Length of pleurocystidia:(57) 65 - 100 
 Width of pleurocystidia:5.7 - 8 (9) 
 Thickness of wall of pleurocystidia:Thin (all structures < 2 µm) 
 Shape of apices of pleurocystidia:Mainly capit./append./acerate 
 Sulfo-vanillin test on pleurocystidia:Variable/weak reaction 
 
Pleurocystidia abundance::
absent no
very dispersed 0-350/mm² no
dispersed 350-700/mm² no
 
rather abund 700-1500/mm² variable
abundant 1500-3000/mm² yes
very abundant >3000/mm² variable
 
 
Marginal cells
 Length of marginal cells:0 
 Width of marginal cells:0 
 
Subhymenium
 Subhymenium:Pseudoparenchymatous 
 Differentiation of supra and subpellis:Obvious 
 Size of cells in supra and subpellis:Same in size 
 Gelification of subpellis:Not gelified (no gel. matrix) 
 
Pileocystidia
 Location of pileocystidia:Suprapellis 
 Septation of pileocystidia:Usually aseptate 
 Shape of apices of pileocystidia:Mainly capit./append./acerate 
 Sulfo-vanillin test on pileocystidia:No color changes 
 Cresyl blue test on pileocystidia:No color changes 
 
Hyphae of pileus
 Diameter of ends of pileipellis hyphae:(2.7) 3.5 - 6 (9) 
 Diameter of primordial hyphae:0 
 Vacuolar pigments of hyphae of pileus:Present 
 Membrane pigments of hyphae of pileus:Absent 
 Wall of hyphae of pileus:Thin (<1 µm) 
 Filamentous hyphae of pileus:Absent 
 
Caulocystidia
 Width of caulocystidia:2.5 - 3.5 
 Thickness of wall of cheilocystidia:Thin (all structures < 2 µm)