----- Original Message -----|
From: "Helmut Reisenberger"
To: "Discussion of aroids"
Sent: Saturday, March 08, 2008 3:00 PM
Subject: Re: [Aroid-l] Cyrtosperma
> -----Urspr?ngliche Nachricht-----
> Von: Discussion of aroids
> Gesendet: 08.03.08 17:05:48
> An: Discussion of aroids
> CC: kaufmanrareplants at yahoo.com
> Betreff: Re: [Aroid-l] Cyrtosperma
I have been growing Cyrtsperma johnstonii for a couple of years in my
greenhouses in Vienna / Austria. Since I can offer them optimal indoor
conditions, - heated greenhouse (25 - 35 Cels.), indirect sunlight +
additional light in winter and relatively high humidity, - they are
vigorious growers (up to two meters in a year) and producing lots of
suckers. The substrate I use is LariAnns recommended mix for the very
sensitive and difficult novelty Alocasias.
The problem is, that the biggest leaves start browning from the margins, and
then spotting the whole leaf blade. At the same time the petioles bend over
and after a short while the leaves are gone. What can be wrong??? I think,
I can offer them optimal conditions, standing next to the difficult
Alocasias ("little jewels"), which I now have under control. Thanks for your
> > Date: Wed, 5 Mar 2008 12:17:11 -0800
> > From: kaufmanrareplants at yahoo.com
> > To: aroid-l at gizmoworks.com
> > Subject: Re: [Aroid-l] Cyrtosperma
> Dear Stan,
> Allow me to attempt to assist you with an I.D. From your description the
> plant you saw in Honduras was/is Lasimorpha senegalensis, which is native
> to W. Africa! A jpeg from you of an inflorsence from the plant you saw,
> which should be yellowish and blotched with purplish markings, would
> confirm it. Your observation of the ''square'' petioles with spikes
> suggests/confirms it's I.D., as all Cyrtospermas have more or less
> rounded (in cross section) petioles with thorns. There is another
> Lasioid genus which occurs in Central and Northern S. America, namely
> Urospatha, but this does not have spikes or spines on the petioles or
> anywhere else. The genus has been recorded in Belize, and so should be
> expected to occur in Honduras in swampy areas. Most species have rounded
> petioles, but one species from near El Tigre in W. Venezuela has
> angled/"squarish' petioles, but never has spines/spikes/thorns, and all
> species of Urospatha have long ''projections'' to the tips of the s
> pathe, some species are cork-screwed, a few are straight and tubular.
> Lots more valuable information, including photos and instructions for
> their cultivation of these most interesting aquatic species can be seen in
> my papers --" Boos, J. O. 1993. Experiencing Urospathas. Aroideana 16:
> 33-36", and "Boos, J. O. 1997. Observations on New World Araceae-Lasieae.
> Aroideana 20: 13-26."
> Additional information on this and all other genera can be had in Deni
> Bown`s remarkable book, "Aroids Plants of the Arum Family", Timber Press,
> ISBN 0-88192-485-7.
> Enid at Natural Selections is a source for these plants, sometimes in
> short supply.
> Susan, the name Alocasia johnstonii was a big error, they are very
> different to and a seperate genus/group to Alocasias.
> I look forward to hearing from you with more information!
> Julius Boos, WPB FLORIDA
> >> Hi Susan,
> > I saw an eight to ten foot example of this in Honduras -with square
> > stems spiked all along the four corners. I have photos of the infls.
> > too. Do you know the species , if it is available in US and whether it
> > can be grown in containers in a greenhouse. It is really spectacular.
> > Stan
> > Susan B wrote:
> > Or whatever this big leaf is... I think Julius was looking for this
> > photo quite a while back...
> > Taken at Fairchild Gardens
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