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  'Self-heading' Philodendrons/fruit..
From: "Julius Boos" ju-bo at email.msn.com> on 2001.09.07 at 07:55:37(7408)
----- Original Message -----
To: Multiple recipients of list AROID-L
Sent: Thursday, September 06, 2001 9:42 PM
Subject: Re: 'Self-heading' Philodendrons.

Dear Eduardo and Donna

Ed, thank you so much for these great observations and comments! Most
interesting stuff!!!!!!

I am very interested in your comments about another species, P. corcovadense
that sometimes takes advantage of the bromilead 'cups' to germinate, and
then eventually grows out of them when they get too large. This would also
be a good possibility and a great 'strategy' in other species that are found
growing high in the canopy, such as P. goeldii and P. solimoesense, we
observed both species in the wild in Fr. Guyana, Joep believes that they
are most often found growing HIGH in the jungle canopy, and only when the
tree is cut down or falls naturally (from death of the tree or a high wind)
are these species then found growing in a terrestrial condition as has
been reported in the literature, we actually saw one huge specimen of
P. solmoesense growing on the ground near the side of a major road, and
Joep remembers when the tree that it used to grow high up in the canopy
was felled during construction on the road!.

So as you have pointed out, they most probably start germination in a
group of bromileads high in the canopy while sending roots down to the
floor to obtain moisture, meanwhile taking advantage of the trapped water
in the bromileads over a period of years till they out-grow the bromilead
and the roots are down to the damp forest floor. Many people may not
realise that some of the huge specimens with rhizomes several meters
long may be well over a hundred years old!!

I have seed a slide taken somewhere
in Coastal Brazil of a species of Philodendron growing in and amongst a BIG
stand or 'wall' of bromileads, it was reported that it did not survive under
conditions. I am going to try to locate a copy of the slide to try to get
a positive I.D. of this species, but from MEMORY (and my old memory
generally is still pretty good!), I THINK it was P. saxicolum, the leaves
also had that distinctive 'blue' cast to them. Have you found this species
also growing in association with bromileads?? By the way, my plant of P.
saxicolum does NOT show this 'blue', do they tend to loose it in
cultivation, and does anyone know what exactly causes it??

What species of primates/monkeys may be found in the dry areas where
P. leal-costae, P. saxicolum and P. adamantiuum occur, perhaps capuchins??

Drop me a line when you have a moment, I hope that things continue to go
well for you.



From: "Eduardo Goncalves" edggon at hotmail.com> on 2001.09.10 at 08:13:50(7439)
Dear Julius,

Well, I only have seen and collected P. saxicolum somewhat far from the
coast, in Bahia state. It usually grows together with Anthurium affine,
always in full (I mean FULL) sunlight! Plants growing in half-shade are
never bluish (it is almost a rule in sun-lovers aroids). Try to give some
sunlight to your plant.
Another interesting aspect is that, in Amazonia (and probably the same
in French Guiana), the diversity (and the biomass) of Bromeliads is not so
impressive like it is in Coastal Brazil. However, there is one thing that
can substitute those tanks for aroids seedling: Ant gardens. Ant gardens
usually hold enough humidity for aroid seedlings and I have seen many
different species of aroids germinating on this (from P. solimoesense to P.
goeldii or Anthurium plowmanii). I think that ant gardens are the main
"germinator" of epiphytic and hemiepiphytic aroids in Northern South
America, and there are lots of Gesneriaceae, Peperomia and other plants
growing on it. In fact, a common name for climbing aroids in Brazilian
Aroids is "tracu?", and the same name is used for painfull ants! To the
native people, climbing aroids and ants have the same name! In Coastal
Brazil, ant gardens are not so common, so maybe the massive beds of
Bromeliads may be used more properly. Life finds a way!
About the monkeys, they vary from small tamarins to whooly monkeys and
capuchins. Marsupials are also known to be "users" of aroid?s
infructescence, but it seems that the importance of bats has been grossly
overlooked in aroid literature.

Very best wishes,


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