I found one pebble of limestone from the Martin formation in Arizona that was shot through with a narrow, stick like coral that I believe is Syringopora sp. The genera is listed by Teichert in his paper and is illustrated by Langland in his article. The calices are very narrow, 3-5mm across and clustered but not in a central mass. Think of them more as loose spaghetti. My sample is small and there is not much exposed of the sides of individual calices, so could this possibly be a form of Aulocystis?
This specimen is from the Jerome member of the Martin formation (Devonian, Fransian stage) north of Payson, AZ.
Teichert, C., 1965, "Devonian Rocks and Paleogeography of Central Arizona", USGS Professional Paper 464
Langland, Jeffrey O. and Edith V., 2012, "Fauna of a 400-Million-Year-Old Coral Reef in
Arizona", Rocks and Minerals, 87:1, 40-44
Stumm, Erwin C., 1948, "Upper Devonian Compound Tetracorals from the Martin Limestone", Journal of Paleontology, Vol. 22:1, pp. 40-47