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Lachnum on Rubus Idaeus
Rasmus Riis-Hansen, 16-05-2019 19:53
Rasmus Riis-HansenHello

I have found this nice Lachnum on last years stem of Rubus idaeus. I firstly thought it was L. clavigerum, but it has a colour change - first yellow as seen on the photo later red-brownish. Also the spores are to big.

Sp. elipsoid-flattened elipsoid, 9-12 x 2-2,5. Asci approx. 55 x 4 µm without croziers, J+ (blue). Hairs cylindrical with warts/spines, some with crystals on the top. Paraphyses fusiform 3,5 µm broad


  • message #57773
Lothar Krieglsteiner, 16-05-2019 20:08
Lothar Krieglsteiner
Re : Lachnum on Rubus Idaeus

Hello Rasmus,

in Lachnum you should first note 3 things:

- croziers (you did  and say no)

- contents of living paraphyses (and hairs) - with or without a large amount of vacuolar guttules. I suggest: no

- crystals on the hairs. You do not mention then, so I think no.

L. clavigerum (as far as I have it in my mind correctly) has crystals on the hairs. I never found it on Rubus, but (as far as I remember) on Epilobium angustifolium.

The most common species on Rubus is L. virgineum - what do you think?

Best regards, Lothar


Rasmus Riis-Hansen, 16-05-2019 20:27
Rasmus Riis-Hansen
Re : Lachnum on Rubus Idaeus
Hi Lothar

Thanks for the comments!

A lot of the hairs does in fact have crystals on the top. Also the colour change when bruised is quite distinct and not present in L. virginum as far as i know.

Best regards
Hans-Otto Baral, 16-05-2019 20:40
Hans-Otto Baral
Re : Lachnum on Rubus Idaeus
Hi Rasmus & Lothar

I have a clavigerum folder for Rubus idaeus, with several samples (including HB 8585).

The spectrum of the species includes also Aruncus etc. I am not sure if there are any clear differences between the substrates, except for spore size:
9-11 x 2-2.5 on Rubus
6-9 x 1.7-2 on Epilobium/Aruncus

So perhaps two species?

Rasmus' description includes crystals. The colour change would point to VBs in the paraphyses and hairs, but for a species with crystals this is impossible. Actually, a yellowish-cream disc is not unusual in L. clavigerum.