Ferocactus macrodiscus forma mostruosa cristata
Scientific name: Ferocactus macrodiscus
forma mostruosa cristata
Origin: The standard F. macrodiscus
comes from exico (San Luis Potosi, Guanajuato, Oaxaca,
Puebla, Queretaro de Arteaga)
The monstrose form is of
garden origin (Nursery
Conservation status: Listed in
CITES appendix 2.
- Ferocactus macrodiscus
ssp. macrodiscus (Torr. & Grant) Britton & Rose
- Echinocactus macrodiscus
- Bisnaga macrodisca
macrodiscus is a medium sized barrel cactus with a flat,
solitary stem up to 30 cm of diameter (but up to nearly 60 in some
cases) and with a blue-green epidermis.
The monstrous form is a genetically stable
mutation with variable,
irregularly shaped ribs with tiny raised, tubercle-like, knobby-looking
swellings along the stems. It is very different and
forms large low
clusters of rubbery-textured cristated
shapes only a few centimetres across.
The plant looks more like a strange green "rock" than a
cactus. Rarely a
spine or a
hair reveal it true nature. This cultivar shows many growing
variations, with different crested and monstrous shapes.
It is very rare and seldom seen only in specialized collections.
Cultivation: It is very slow growing but does
well under cultivation. Suited for any rich, well drained soil (Ph 6).
Grow it in full sun throughout the year. In winter keep completely dry
at 10°C, but it can tolerate sporadic light frost. Anyhow it's
problematic if the temperature goes below 5° with high humidity during
the winter rest. Even adult specimens are affected by wounded spots in
their epidermis. It takes less watering than the standard for other
ferocacti. It's necessary to be avoid wetting the bodies of these
plants while they are in sunlight. A wet cactus in the sun light can
cause sun burning, which can lead to scars, or even fungal infections
and death. It is apt to undergo attacks of red spiders if it is placed
near fruit trees.
F. macrodiscus f. mostruosa
does not apparently flower or seed. All
specimens in cultivation must at one time have been propagated
vegetatively. This plant is almost always propagated by cutting but some
reports that it can be also increased by cuttings, which will take root
in a minimum temperature of 20° C. Cuttings of healthy shoots can be
taken in the spring and summer, Cut the stem with a sharp, sterile knife
just above a bud or shoot (a 7-10cm long tip or branch is most suitable
for propagation). Leave the cutting in a warm, dry place for a week or
weeks (depending on how thick the cutting is) until a callus forms over
the wound. Once the callus forms, the cutting may be inserted in a
container filled with firmed cactus potting mix topped with a surface
layer of coarse grit. They should be placed in the coarse grit only;
this prevents the cut end from becoming too wet and allows the roots to
penetrate the rich compost underneath. The cuttings should root in 2 to
conspecific taxa, varieties, forms and cultivars of Ferocactus