![Thumbnail: [Volume 82, 1954-55 page 618]](/journals/rsnz/images/rsnz_82/thumbnails/rsnz_82_03_0724_0618_ac_02.gif)
Subgenus Transeptia Subgen. Nov.
Basidiis ad apicem septo transverso divisio, parte apicali dein longitudinaliter et cruciatim septata.
Typus: Tremellodendropsis transpusio.
Some authors would probably place Tremellodendropsis in the Tremellaceae, regarding the partial or complete septation of the apical region of the basidium as anomalous for the Clavariaceae; the subgenus Transeptia might even be placed in the Auriculariaceae because of the transverse septation. However, transverse septation of old basidia occurs not only in members of the subgenus Tremellodendropsis but also in other members of the Clavariaceae—e.g., Clavulina. It is therefore not unreasonable to suppose that the time of septation occurs earlier in the young basidia of subgenus Transeptia. The members of the genera Aphelaria and Tremellodendropsis form a sequence from the nonseptate elongate clavate basidium, through the still elongate clavate but partially septate basidium, to the “Transeptia” basidium where the apical portion is cut off by a transverse septum to give a cruciately septate region. All these basidia differ from the typical Tremellaceous basidia in still being clavate, not globular. The genus Tremellodendropsis provides a link between the Clavariaceae, Tremellaceae and Auriculariaceae.
![Thumbnail: [Volume 82, 1954-55 page 619]](/journals/rsnz/images/rsnz_82/thumbnails/rsnz_82_03_0725_0619_ac_02.gif)
| Subgenus Tremellodendropsis |
| Basidia cruciately subseptate at apex. |
| Spores elongate, mostly twice as long as broad. |
[The section below cannot be correctly rendered as it contains complex formatting. See the image of the page for a more accurate rendering.]
| sp. 12–20 × 5–9μ, ellipsoid-amygdaliform | 1. T. tuberosa |
| sp. 9–16 × 4.5–7μ, mostly oblong-ellipsoid | 2. T. pusio |
| Spores broadly-oblong, ovoid to subglobose. | |
| sp. 7–11 × 5–7μ, mostly broadly-oblong | 3. T. flagelliformis |
| sp. 8–12.5 × (6-) 7–9μ, mostly broadly-ovoid to subglobose | T. flagelliformis var. ovalispora. |
| sp. (10-) 12–15 × 6–9μ, mostly broadly-oblong | T. flagelliformis var. tasmanica |
| Subgenus Transeptia | |
| Basidia with a transverse septum cutting off a cruciately septate apical region, before spore formation | |
| Spores elongate, subcylindrical to subsigmoid. | |
| sp. 9–15 × 4–7μ, fruit body white | 4. T. transpusio |
| sp. 8–13 × 4–7μ, fruit body pink-buff | T. transpusio var. minor |
| Spores broader. | |
| sp. 10–14 × (6-) 7–9μ | T. transpusio var. inflata |
Delimitation of species of Tremellodendropsis is difficult; morphologically they are all very similar, both in the fresh state and even more so when dried. Differences in size, length of stalk, degree of flattening of branches, and compactness of plant have been observed, but the growth form is most probably dependent on environmental conditions. In the related genus Aphelaria a similar wide range of growth forms has been recorded for A. dendroides. Spore size is usually regarded as a fairly constant character, but if the basidia produce from one to four spores a wide range in spore size from any one plant might be expected.