Yunnan’s summer markets sell dozens of boletes, and several of the red or pink ones turn blue when handled. Traders group them under the name jian shou qing. For research material, “close enough” is not good enough, so this is how we separate them.
Which boletes are most often confused with Lanmaoa asiatica?
The common confusions in Yunnan are Butyriboletus roseoflavus, species of Baorangia, and red-pored Rubroboletus species such as R. sinicus. Dark bluing boletes like Neoboletus are sold alongside them. Outside China, other Lanmaoa species and red Boletus sensu lato are the main risks.
| Species | Cap | Pores | Stipe | Notes |
|---|---|---|---|---|
| Lanmaoa asiatica | Rose-red to brick-red, dry, finely velvety | Yellow, small, bluing fast | Yellow above, red below, no prominent net | Flesh yellow, blues within seconds |
| Butyriboletus roseoflavus | Pink to purplish red | Yellow | Yellow, with a clear raised net (reticulum) | The “yellow” jian shou qing of markets |
| Baorangia spp. | Red-brown to brownish red | Yellow, with a thin pore layer | Yellow to reddish | Pore layer noticeably shallow in section |
| Rubroboletus sinicus | Red to pinkish red | Red to orange-red | Red, net-patterned | Red pores are the quick separating feature |
| Neoboletus spp. | Dark brown | Yellow to orange, bluing to almost black | Brown to reddish, dotted | The “black” jian shou qing |
Treat the table as a field sorting aid. Colours overlap, and young, old or rain-washed specimens can sit between two columns.
What is the quickest way to rule out Rubroboletus?
Look at the pore surface. Lanmaoa asiatica has yellow pores. Rubroboletus species have red to orange-red pores and usually a red, net-patterned stipe. A red cap on its own says little, because several genera share it. Pore colour on a fresh, unbruised specimen is the fastest reliable check.
How do you separate Butyriboletus roseoflavus?
Check the upper stipe. B. roseoflavus has a clear raised network (reticulum) over a yellow stipe, and its cap tends toward pink or purplish red. L. asiatica lacks a prominent net and its stipe is flushed red in the lower half. Cut both: the bluing of Lanmaoa flesh is usually faster.
Can dried slices be identified by eye?
Not reliably. Drying darkens the cap, mutes the red of the stipe and destroys the bluing reaction. Slices of different red boletes can look the same. For dried or powdered material, identity has to come from records made before drying, backed by an ITS sequence from the batch.
That is why every batch we sell carries an identity result based on fresh morphology plus DNA, and why we never mix lots from different collection points into one batch.
Why does correct identification matter so much here?
Because results do not transfer between species. Bluing boletes differ in pigments, element uptake and, in some cases, in their association with poisonings. A chemical profile or bioassay run on mixed or misidentified material describes the mixture, not L. asiatica, and may not be reproducible by another lab.
References
- Wu G. et al. (2016). One hundred noteworthy boletes from China. Fungal Diversity 81.
- Schoch C.L. et al. (2012). Nuclear ribosomal ITS region as a universal DNA barcode marker for Fungi. PNAS 109: 6241–6246.