Thanks everyone
Carrie - it's on a wood stick of uncertain origin ... it was given to me by the person I got the plant from, who is a big enthusiast for mounting orchids
It's from a non-coniferous street tree
She thought it might be ginkgo (which is supposedly a soft wood - this doesn't seem especially soft to me, but the color looks about right). The plant has not had objection to the mount, so, I guess time will tell if it holds up well.
I water well when the sphag is completely dry (daily much of the year for me). Over winter, the mount was set into a clay pot, so it could sit on a windowsill. The sphag would remain moist 2-3 days this way (along with lower temps), but I would spritz roots that have crept out beyond the sphag daily (even our winter humidity has been low with the drought).
Where I had this growing outdoors, it got several hours of morning sun in the summer (til noon). I don't think it requires that much sun, but it took it fine (tho did take on a reddish-purplish hue)
IOSPE indicates warm to hot temps for this species, tho, while mine has taken hot daytime temps well (tho shaded by noon), inside in winter it's definitely gets more intermediate (even slightly cool) temps (I've seen it reported as an intermediate grower elsewhere).
I hope that helps