Observation 208173: Strobilomyces confusus Singer
When: 2015-06-29
No herbarium specimen

Notes: Fresh Strobilomyces specimen growing from the trunk of a large mature Shortleaf Pine. This is the second, Observation 205619, of this genus I’ve found growing directly out of a Shortleaf Pine trunk. I thought the first might be an odd accident, but this one was attached via a short side-ways stem directly to the tree bark.

In each case, the trees were large mature healthy trees. This one was at least 20 inch diameter at the base. This specimen was growing about 3 inches above the ground, similar to the previous observation. This specimen was fresh, the top tufts soft, the gills soft. The previous one was completely desiccated. I discussed this with Dr. D. Lewis who has collected for years in the Big Thicket. He says it is not unusual for Boletes, including S. confusus. He thinks it is the mycelium escaping wet and flooded conditions. This describes the extreme wet this spring and early summer in all East Texas.

Upon slicing, the cross-section was pale but quickly turned a rosy tan, then eventually black. I noticed no smell, but I have hay-fever.

Microscopy:

I created a small scalp of the cap, then cut a thin section from the scalp. I’ve attached images of the cap surface material.

The cells at the outer surface were difficult to observe as they were very dark and filled with dark material. Cells lightened as they progressed inward. The more interior ones were easier to view and show dark walls and dark material forming inside. The cells more interior in the white layer were very light, no dark walls and appeared to be a jumble of short segments(no image).

Spores were found and showed Spore ornamentation of ridges and lines which did not form a complete reticulum. Shown in last photo.

This indicates that it best fits Strobilomyces confusus

Images

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Growth at Base of Shortleaf Pine
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400X – Cap surface interior cells – note dark walls and dark cell contents.
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400X – interior cells – dark walls
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400X – interior cells – dark walls
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400X – interior cells – dark walls
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20150629-LX1_2015P1050323.jpg
400X – dark cap surface cells
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1000X – dark cap surface cells
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1000 X – Cap – outer dark surface – cystidia
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20150629-LX1_2015P1050333.jpg
1000 X – Cap – Spore ornamentation of ridges and lines, does not form a complete reticulum

Proposed Names

28% (1)
Recognized by sight
56% (1)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2015-06-29 18:02:27 PDT (-0700)
Last modified: 2015-07-01 06:19:22 PDT (-0700)
Viewed: 56 times, last viewed: 2016-10-28 08:42:29 PDT (-0700)
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