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Professional, Scholarly, or Creative Work:
Simpson,P.D. _____. An Update on Nicaraguan Orchids.
In Prep. Orchids.
Simpson, P.D. 1996. Observations on the Orchids near Matagalpa,
Nicaragua. Orchid Dig. 60: 36- 39.
Simpson, P.D. 1988 Observations on Phragmipedium from Tingo Maria, Peru.
Orchid Dig. 52: 81-84.
Simpson, P.D. 1987. A note on Stanhopea. Nat. Cap. Orchid. Soc. Bull.
46(3): 5-7.
Simpson, P.D., E.P. Karlander and S.D. Van Valkenburg. 1978. The growth
rate of Mychonastes ruminatus
Simpson et Van Valenburg under various light, temperature salinity
regimes. Br. Phycol. J. 13: 291-298.
Simpson, P.D. and S.D. Van Valkenburg. 1978. The ultra structure of
Mychonastes ruminatus gen. et sp. nov., a new member of the
Chlorophyceae isolated from brackish water. Br. Phycol. J. 13: 117-130.
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