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General information

 Substratum:Terricolous 
 
Continent::
Africa no
North America yes
S. and C. America no
 
Asia no
Australia no
Europe yes
 
 Authority:J. Schaeffer 
 Synonyms and close species:S: R. gracilis Burl. (?)
C: R. versicolor
R. sphagnophila
 
 Information given by author(s):Piperinae exalbicantinae
Rare
Type : 56-187
 
 Host(s):Deciduous (Betula pubescens) 
 Taxon name_Mycobank:
 
 Bibliography:
 

Macro-characters

 
Stipe
 Width of stipe:5 - 12 
 Veil:Absent 
 Form of base of stipe:Not radicate 
 Form of stipe:Inflated at top to straight 
 Context of stipe:Solid, spongy 
 
Main color(s) of stipe::
grey/black no
brown no
white yes
yellow/cream yes
blue no
 
orange no
red/pink yes
purple/vinaceous no
green no
   
 
 Length of stipe:35 - 70 
 
Pileus
 Type of pileipellis:Smooth 
 Striations of pileus:Absent to weak or both 
 Viscosity of pileus:Viscid/viscous even if dry 
 Form of center of pileus:Conc./plane/conv./umbil./umbo. 
 Separability of pileus:Medium (from25% to 75%) 
 
Thickness of flesh of pileus
 Thickness of flesh of pileus:Thick 
 
Main color(s) of pileus::
grey/black variable
brown no
white no
yellow/cream yes
blue no
 
orange no
red/pink variable
purple/vinaceous variable
green no
   
 
 Diameter of pileus:20 - 50 
 
Lamellae
 Spacing of lamellae:Variable 
 Number of lamellulae:Less than lamellae 
 Furcation of lamellae:Everywhere (min 3 to 4/carp.) 
 Color of ridges of lamellae:Fully concolorous with faces 
 Attachment of lamellae:Free/decurrent 
 Type of lamellar ridges:Entire/smooth 
 
Main color(s) of lamellae::
grey/black no
brown no
white yes
yellow/cream yes
blue no
 
orange no
red/pink no
purple/vinaceous no
green no
   
 
 Height of lamellae:3.5 - 5 
 Odor:Variable/weak and pleasant 
 Flavor of flesh:Sweet to bitter or both 
 
Color changes
 Fruit body turns green/blue with age:Not turning green/blue 
 Fruit body turns br. yellow if touched:Not turning bright yellow 
 Fruit body turns black with age/touched:Not blackening 
 Fruit body turns grey with age:Not turning grey 
 
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:7.2 - 8.5 
 Width of spores:5.2 - 6.5 
 Amyloid plage:Present 
 Appearance of spores verrucae:Tips acute/sharp/pointed (/) 
 Ornamentations in surface view:Round bases to irregular/both 
 Connection(s) between verrucae:Joined by fine and low lines 
 Overall appearance of spores:Not reticulate 
 Height of verrucae:0.5 < x < 2 µm 
 Color of spore deposit:4 
 Pictures from Romagnesi, 1967_Link:
  • 3\251a.jpg
 
 
Basidia
 Length of basidia:(25) 35 - 47 (50) 
 Width of basidia:8.5 - 9.5 (11) 
 Number of sterigmata per basidium:Four 
 
Pleurocystidia
 Length of pleurocystidia:(60) 70 - 92 (100) 
 Width of pleurocystidia:10 - 14 
 Thickness of wall of pleurocystidia:Thin (all structures < 2 µm) 
 Shape of apices of pleurocystidia:Mainly capit./append./acerate 
 Sulfo-vanillin test on pleurocystidia:Blue/black/red/pur./or./brown 
 
Pleurocystidia abundance::
absent no
very dispersed 0-350/mm² ?
dispersed 350-700/mm² ?
 
rather abund 700-1500/mm² ?
abundant 1500-3000/mm² ?
very abundant >3000/mm² ?
 
 
Marginal cells
 Length of marginal cells:0 
 Width of marginal cells:0 
 
Subhymenium
 Differentiation of supra and subpellis:Obvious 
 Size of cells in supra and subpellis:Same in size 
 
Pileocystidia
 Width of pileocystidia:5 - 8.5 (10.5) 
 Location of pileocystidia:Suprapellis 
 Septation of pileocystidia:Septation variable 
 Shape of apices of pileocystidia:Mainly rounded 
 
Hyphae of pileus
 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