Taken primarily from Kozloff, 1987, 1996 p. 70 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Rachis and branches fleshy, pale to vivid orange (picture) | Ptilosarcus gurneyi |
| 1b | Rachis and branches slender, not especially fleshy, white or almost white | 2 |
| 2a | Rachis smooth to the touch, without projecting calcareous spicules | Virgularia spp. |
| 2b | Rachis rough to the touch, owing to projecting calcareous spicules | Stylatula elongata |
