Notes:
Collected by Chad Hyatt and passed on to David Arora.

Under mixed manzanita and pine. Latex white and doesn’t change color.

All micrographs at 1000x except for one which is noted. Pleurocystidia in Melzer’s and cheilocystidia in Congo red. With Amscope b120ms and Samsung s7 edge.

A basidium measures 57 × 9.5, sterigmata 4 micrometers. 2 and 4 spored basidia present.

Spores (5.9) 6.5 – 7.8 (10.5) × (4.7) 5.9 – 7.2 (7.7) µm
Q = 1 – 1.2 (1.4) ; N = 30
Me = 7.2 × 6.5 µm ; Qe = 1.1

7.27 6.94
7.27 6.38
7.79 7.16
6.24 6.02
7.83 6.71
7.38 6.40
7.16 7.16
6.31 4.69
6.56 5.87
7.10 6.32
7.38 6.99
7.53 6.88
7.13 6.74
7.64 6.94
7.15 5.85
6.62 6.38
7.02 6.81
6.52 6.41
8.84 7.43
7.21 6.11
6.83 6.83
5.86 5.31
7.38 6.40
6.80 6.56
10.51 7.75
7.58 6.47
6.73 6.29
7.02 7.02
6.56 6.32
7.17 6.62

Cheilocystidia 39.8 – 52.3 × 7.8 – 10.68 (10.7) µm
Q = (3.7) 3.72 – 5.36 (5.4) ; N = 5
Me = 43.7 × 9 µm ; Qe = 4.9

42.17 7.92
43.06 9.03
40.95 7.79
52.32 9.76
39.76 10.68

42.03 10.43
80.78 10.11
65.07 8.54

42.03 10.43
80.78 10.11
65.07 8.54

Pleurocystidia 42 – 80.78 (80.8) × (8.5) 8.54 – 10.4 µm
Q = 4 – 8 ; N = 3
Me = 62.6 × 9.7 µm ; Qe = 6.5

Images

DSC_0102-m.jpg
Copyright © 2015 Chad Hyatt
Post processed with Photoshop
DSC_0102.JPG
Copyright © 2015 Chad Hyatt
lactarius-tree-mega.jpg
ITS tree created with Mega X
lactarius-tree.jpg
ITS tree created with PhyML via phylogeny.fr
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20190603_160250.jpg
same image, 1000x, less zoomed in
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400x zoomed in
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20190603_155206.jpg

Proposed Names

58% (1)
Recognized by sight
87% (1)
Recognized by sight
Used references: Noah Siegel and North American Species of Lactarius page 432
Based on microscopic features: Spore size, texture and shape, cheilocystidia and pleurocystidia size match

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus

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