Michael F. McNulty wrote:

Does anyone know anyone that knows a lot about the genus Tylecodon?
Michael McNulty

You could try G. Williamson at department of botany in the University of
Cape Town. He have described a new species in the genus in 1998.

Williamson, G. 1998. A new Tylecodon Species (Crassulaceae). Cactus and
Succculent Journal 70:127-128.

In future you can use the excellent database of tropical flora at mobot to
find the authors of genuses and species.

http://mobot.mobot.org/W3T/Search/vast.html

Ingar