Level of fertility in Botrychium simplex; a: linear correlation between leaf length and number of sporangia in 2002; b: mean number of sporangia per leaf since 2004; c: proportion of sterile leaves since 2004; it should be noted that in the year 2009, all 5 leaves were fertile, thus, the proportion of sterile leaves was 0%.  

Level of fertility in Botrychium simplex; a: linear correlation between leaf length and number of sporangia in 2002; b: mean number of sporangia per leaf since 2004; c: proportion of sterile leaves since 2004; it should be noted that in the year 2009, all 5 leaves were fertile, thus, the proportion of sterile leaves was 0%.  

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This paper provides a brief portrait of Botrychium simplex and starts by describing its biological characteristics and distribution in Germany. In the third part, a demographic study is presented reporting on long-term observations of the only presently known German population (Senne area, North Rhine-Westphalia). As with all moonworts, the spores...