Platycerium Holttumii

 

 

 

 

 

 

 

  Many lobes per fertile frond, one spore patch per lobe.
  One lobe is small and elevated, one s large and hanging down.

 

 

 

Photo: Khuan Somkhuan, Thialand

   
P. holttumii is from Southeast Asia and Malaysia.  It is a large platy like P. superbum, P. grande, P. wandaei.  It differs from the first two by having fertile fronds with two lobes with spore patches, one smaller (labeled A in photo above) and elevated, and one larger and hanging down (labeled B).

Roy Vail reports that in the 1970 paper which separated P. grande and P. superbum, Joncheere and Hennipman described the P. holttumii as a new species.  It is named for Dr R. E., Holttum of Kew, New England, author of "A Revised Flora of Malaya.

In practice it can be very difficult to tell P. holttumii from P. wandae.  Since their fertile fronds are about the same shape.  The lack of little frills on the shields at the bud diferentiate the P. holttumii from  P. wandae,  as depicted in the P. grande photo on the right.  Roy Vail points out that in a P. wandae with old shields, its little frills may die back causing it to look like P. holttumii until new shields form.  It is also impossible to tell P. grande, P. superbum, and P. holttumii apart when small.

Roy Vail located three people who felt branching of the rhizome occasionally happens in P. holttumii.  One showed a large bulge under the shields near the bud which was thought to be a rhizome branch growing trapped underneath.  Another had a set of shields with a rhizome and bud which had fallen off a large plant, and was mounted as a separate new plant.  The third wrote of a P. holttumii pup.

Hobbyists should grow P. holttumii in bright locations for best results.  During growing seasons, water more frequently and keep it extra moist.  P. holltumii can not be expected to tolerate the low temperatures as P. superbum, however they should be treated the same.

Today, the main source may be imports of small samples from Thailand.  When received, Roy Vail suggests treating with terramycin to prevent any bacteria.

Roy Vail reports that in the early 1970 Robert Oman in Miami received a group of 50 small plants from California labeled, P. holttumii sporelings.  When mature their fertile fronds developed unusual shapes.  Of the starting 50, 44 went to Puerto Rico.  Of the remaining, 6, one of the offspring's is in the trade as Glasshouse Works and pictured on the left. Looks a lot like P. grande, and P. superbum when young and before fertile fronds form.

 

 

The photo on the right is a young sporeling obtained from a seller in Louisiana.  Currently the plant is in a winter dormant stage.


 
Comparison of; P. grande, P. superbum, P. holttumii, P. wandae

Species

P. grande

P. superbum

P. holttumii

P. wandae

Common Name

Grande

Superbum

Holttumii

Queen Staghorn

Temp Range

40 to 100 F

 30 to 100 F

60 to 100 F *

60 to 100 F *

Number of fertile fronds with lobes Many, divided Many,
not divided
Many with 2 lobes
1 elevated, 1 hanging down
Many with 2 lobes
1 elevated, 1 hanging down
No. Spore Patches

 Two  per Lobe

One per lobe

One per lobe

One per lobe

Spore Patch shape

Equal size

Oval/triangular

1 small elevated
1 large hanging down

1 small elevated
1 large hanging down

Frill around bud

No

Yes

No

Yes

Volunteer Pups

No

No

No

No

Native to:

Philippines

Australia

SE Asia

New Guinea

Growing environment

50% shade cloth

50% shade cloth Greenhouse

Greenhouse

 

[ Plant Glossary ]

Return to main page