Ultrastructure of the Septal Pore Apparatus of Tremella

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Abstract
The septal pore apparatus [studied by EM] of this species of Tremella is similar in structure to that of other basidiomycetes in that it has a dolipore, each opening of which is covered by a pore cap. However, the structure of the pore cap is very different; it comprises a number of cupulate units instead of the more common single-unit pore cap of other dolipore/parenthesome septa. The limiting membrane of each cupulate body is continuous with the endoplasmic reticulum, as are the membranes of simple pore caps in other basidiomycetes. The electron-dense plate next to the limiting membrane of the cupulate body is similar to the electron-opaque line in the lumen of the pore cap of other basidiomycetes. Apparently each cupulate unit of the pore cap in this species of Tremella, and also others like it, is equivalent to the pore caps found in other basidiomycetes. Therefore the pore cap here is compound rather than fragmented. The presence of a compound pore cap in Tremella sp. is significant because they have previously been reported only in Filobasidium capsuligenum. Even Exidia, usually considered to be one of the closest relatives of Tremella, has a simple pore cap. A well developed pore cap is not present in either Filobasidium floriforme Olive or Filobasidiella neoformans Kwon-Chung, another representative of the Filobasidiaceae.

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