One spore patch for each fertile frond.
|Platycerium superbum is
native to Australia and for many years was classified as a P. grande.
In about 1970, the two were split into two different species. For this
reason there may be a lot of confusion as to which species you are growing
as both were called P. grande and it is taking a while for the trade
to catch up with the two different species. Because of this confusion,
many P. superbum
were labeled P. grande, and many P. superbum were labeled
P. grande. When affordable DNA testing comes available in the near
future, you will be able to get a better handle on which species you have.
Shield fronds are deeply lobed and may reach 4 ft tall. Upper edges
extend forward to form a catch basin. Once the shield fronds reach 2
ft. fertile fronds can be expected. Before the shield fronds die and curve
inward, a new green shield frond will cover the older frond while still
green. Each fertile frond has one spore patch, oval to nearly
triangular and brown when mature. Large reclining foliar fronds light
green in color. Does not pup. Hardy to 30°F (–1.1°C) for short periods,
although prolonged cold temperatures not tolerated. Likes brighter light
than the average staghorn.
The P. superbum shown on the right is on
the cover of the April 2015 issue of the LAIFS Journal and has grown in
Southern California on a palm tree. Recently the tree was removed and
the platy was relocated to the Huntington Library. This very large
example of P. superbum appears to be almost 20 ft tall.
The P. grande is generally considered difficult to grow, whereas the P. superbum is usually considered easy to grow and very tolerant of full sun. In nature, some P. superbum are found growing on rocks. It can tolerate temps down to freezing. There are reports of the fertile fronds of P. superbum getting a sunburn on the upper surface of the spore patch lobes when the temperature is too high.
* The temp range of the P. grande is probably close to the P. superbum but not quite as cold tolerant.
** Frequently the first fertile frond of P. grande may be undivided
with only one spore patch.