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Re: Message from Bernhard about Typhonium

  • Subject: Re: Message from Bernhard about Typhonium
  • From: "D. Christopher Rogers" <branchiopod@gmail.com>
  • Date: Tue, 7 May 2013 13:46:20 -0500

Hiyer, Bernhard!

I think that you mean the mark that would appear to be a depression in the side of the tuber. If that is the case, I think that is where and offset was released, and some rot occurred at the union and then healed.

I have had plants of this species and some Amorphophallus that would occasionally not completely consume the old tuber. However, the remains of the old tuber were always directly below the new tuber. The central primary growing point of the plant is that central point, surrounded by the primary roots,  where the leaf and inflorescence grow up and the tuber shrinks and and regrows from the bottom. This is the apical meristem, and the leaf and inflorescence will always grow from that same spot, year after year.

Remember that as the inflorescence and leaf grow, the tuber shrinks towards the meristem, like a deflating balloon.  It regrows in the same way, expanding outward like a balloon from that same point. It is not like Anchomaenes or Gonatopus, where leaves can grow anywhere over the upper surface of the tuber and the tuber is not completely consumed.

I really hope that this helps!

Happy days,

On Tue, May 7, 2013 at 11:05 AM, Zach DuFran <zdufran@gmail.com> wrote:


in our German amorphohallus-forum we have a question to explain a often seen mark on big T. venosum tubers.

For details see the pictures and contributions in posts # 96, 93, 97 and 98.

The forum language is German but at the bottom of the page there is translation fuction implemented.

In German:


maybe the link with the translated page works also:


The questionis, if the mark on picture 2 in post 93 can be related to the peduncle.

(I just notice that some of the pictures are not displayed automatically in the English translation; you might have to click the links; sorry.

for instance: http://www.amorphophallus-forum.de/index.php?page=Attachment&attachmentID=1251 )

There is controversion, because it is assumed that the old tuber is consumed / replaced totally (post # 96) and in this case the mark cannot be associated with the lst year's peduncle.

On the other hand there might be an indication that the offsets go back to buds that might be present on the tuber at the beginning of the new growing cycle and that those parts of the tuber are still present at the end of the growing cycle below the mark on the tuber (in other words: the old tuber is not consumed / replaced totally) - see post # 97 and picture 1 and 6 in post # 93.

I hope these questions is somehow understandable.......  ;-)

Looking forward to any comment !

Cheers, Bernhard.

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D. Christopher Rogers
Crustacean Taxonomist and Ecologist
Kansas Biological Survey
Kansas University, Higuchi Hall
2101 Constant Avenue, Lawrence, KS 66047-3759 USA

Affiliate, Invertebrate Zoology, Biodiversity Institute, The University of Kansas

Associate Editor, Journal of Crustacean Biology http://www.thecrustaceansociety.org/
Southwest Association of Freshwater Invertebrate Taxonomists SAFIT.ORG

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