Literature

Authors	Year	Title
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D. Oliver	1897	Flora of tropical Africa
F. W. Oliver	1890	On Sarcodes sanguinea Torr.
A. R. Olson	1994	Pollen tube pathway through the gynoecium of Monotropsis odorata (Monotropaceae)
A. R. Olson	1993	Pattern of embryo and endosperm formation in Monotropa hypopitys (Monotropaceae) from North America and western Sweden
A. R. Olson	1991	Postfertilization changes in ovules of Monotropa uniflora L. (Monotropaceae)
A. R. Olson	1991	Gynoecial pathway for pollen tube growth in the genus Monotropa
A. R. Olson	1990	Observations on the floral shoots of Monotropa hypopitys (Monotropaceae)
A. R. Olson	1989	Changes in postfertilization ovules of Monotropa uniflora L. (Monotropaceae)
A. R. Olson	1980	Seed morphology of Monotropa uniflora L. (Ericaceae)
P. T. Ong	2015	A revision of Gastrodia in peninsular Malaysia
P. T. Ong, O´Byrne P.	2012	Two new species of Gastrodia from Terengganu, Peninsular Malaysia
P. Ormerod	2017	Checklist of Papuasian Orchids
P. Ormerod	2013	Studies of neotropical Goodyerinae (Orchidaceae) 5
P. Ormerod	2005	Notulae Goodyerinae
P. Ormerod	2003	Orchidaceous additions to the Floras of China and Vietnam
P. Ormerod	2002	Taxonomic changes in Goodyerinae (Orchidaceae: Orchidoideae)
P. Ormerod	2001	Pseudovanilla montigena
P. Ormerod	2000	Orchidaceae fragmentae (continued), part 2.
P. Ormerod, Juswara L.	2019	New names in indonesian orchids
E. Ortúñez, Gamarra, R., Gestal, S., Hernando, A., P. Cela, G.	2020	Revision of Eulophia (Orchidaceae) in Nigeria, Cameroon, Equatorial Guinea, Gabon, and the Republic of the Congo
G. A. Oterino, E. Hernandez R.	1986	Some plants form the valley of Montemayor Province of Salamanca, Spain
J. F. G. Pabst, Dungs F.	1975	Orchidaceae brasiliensis
C. Paduano, Rodda, M., Ercole, E., Girlanda, M., Perotto, S.	2011	Pectin localization in the mediterranean ochid Limodorum abortivum reveals modulation of the plant interface in response to different mycorrhizal fungi
P. Palacios-Mayorga, Pérez-Silva E.	1993	Endotrophic mycorrhiza in Lacandonia schismatica, Lacandoniaceae, a new saprophytic Angiospermae family
S. K. Patra, Ghosh, R. B., Gupta, D., Bhattacharya, K. N.	1992	Burmannia coelestis L. (Burmanniaceae): a new record from West Bengal
T. C. Paulitz, Menge J. A.	1984	Is Spizellomyces punctatum a parasite or saprophyte of vesicular-arbuscular mycorrhizal fungi
N. Pearce, Cribb P.	1999	Notes relating to the Flora of Bhutan: XXXVII. New species and records of Orchidaceae from Bhutan and India (Sikkim)
H. A. Pedersen, Kurzweil, H., Suddee, S., Vogel, E. F., Cribb, P. J., Chantanaorrapint, S., Watthana, S., Gale, S. W., Seelanan, T., Suwanphakdee, C.	2014	Flora of Thailand, Volume 12, Part 2 Orchidaceae 2 (Epidendroideae P.P.: Neottieae, Tropideae, Nervilieae, Gastrodieae, Thaieae, Calypsoeae, Arethuseae, Collabieae, Cymbidieae)
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J. Peklo	1906	Zur Lebensgeschichte von Neottia nidus avis L
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O. Penzig	1901	Beiträge zur Kenntniss der Gattung Epirrhizanthes Bl
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C. H. Persoon	1805	634. Vohiria
P. M. Petersen	1972	Cryptothallus mirabilis Malmb. found on Disko Island, West Greenland (69°15' N., 53°34' W.)
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R. L. Peterson, Howarth, M. J., Whittier, D. P.	1981	Interactions between a fungal endophyte and gametophyte cells in Psilotum nudum
D. Petrie	1893	Description of a new genus and of new species of native plants
W. Pfeffer	1877	Ueber fleischfressende Pflanzen und über die Ernährung durch Aufnahme organischer Stoffe überhaupt
N. E. Pfeiffer	1918	The sporangia of Thismia americana
N. E. Pfeiffer	1914	Morphology of Thismia americana
R. A. Philippi	1864	Zwei neue Pflanzen aus Chile
V. - A. de Philippis	1938	Studio morfologico ed anatomica di Leipaimos brachyloba' (Griseb.) Urb. var. 'cumbrensis' Urb. et Ekm.
R. Pilger	1905	Beiträge zur Flora der Hylaea nach den Sammlungen von E. Ule.

Authors