Table 1

Summary of previous studies on North American Dryopteris
Year Reference Hypothesis in Figure1that is supported, in whole or in part Type of Observation/Study
1953 Crane [20] H Spore morphology
1953 Manton & Walker [21] I, J, or K for D. filix-mas; A for others Cytological observations
1955 Walker [13] A Cytological observations
1959 Walker [22] A Cytological observations
1961 Walker [23] A Cytological observations
1962 Walker [24] A Cytological observations
1962 Wagner & Hagenah [25] A Morphology
1963 Wagner [26] A Morphology, cytological observations
1969 Wagner, Wagner, Hagenah [18] A Morphology, cytological observations
1969 Widén & Britton [27] F for D. campyloptera; A for others Cytological observations, chromatography, morphology
1969 Walker [28] A Cytological observations
1969 Widén & Sorsa [29] G Cytological observations, chromatography
1971 Widén et al. [30] J Chromatography
1971 Widén and Britton [31] F for D. campyloptera; A for others Cytological observations, chromatography
1971 Widén and Britton [32] A Cytological observations, chromatography
1971 Widén and Britton [33] I Cytological observations, chromatography
1972 Britton [34] A Spore morphology
1972 Fraser-Jenkins & Corley [35] K Morphology
1974 Britton & Widén [36] A Cytological observations, chromatography
1975 Hickok & Klekowski [37] B Cytological observations
1976 Fraser-Jenkins [38] K Cytological observations
1977 Gibby [39] A Cytological observations
1977 Gibby & Walker [40] C Cytological observations
1978 Gibby, Widén, Widén [41] C Cytological observations, chromatography
1983 Petersen & Fairbrothers [42] A Chromatography
1985 Widén & Britton [43] D Chromatography
1985 Werth [8] A Allozyme
1986 Viane [44] A Trichome morphology
1989 Werth [45] A Isozyme analyses
1989 Werth & Kuhn [45] A Morphology
1991 Werth [46] A Isozyme analyses
1992 Hutton [47] A plastid restriction site analyses
2010 Stein et al. [48] A Isozyme analyses, plastid restriction site analyses
2011 Juslen et al. [49] A (plastid), E (nuclear) plastid, nuclear sequence data
2012 Sessa et al. [16] A plastid sequence data
2012 Sessa et al. [17] A plastid, nuclear sequence data

For each publication, the type of observation or study is given, along with the hypothesis that was supported by the data, as presented in Figure 1.

Sessa et al.

Sessa et al. BMC Evolutionary Biology 2012 12:104   doi:10.1186/1471-2148-12-104

Open Data