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A version of the Serenity prayer appearing on an Alcoholics Anonymous medallion (date unknown).. The Serenity Prayer is an invocation by the petitioner for wisdom to understand the difference between circumstances ("things") that can and cannot be changed, asking courage to take action in the case of the former, and serenity to accept in the case of the latter.
The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes (lycophytes and ferns) that reflects knowledge about plant relationships discovered through phylogenetic studies. In 2016, the group published a classification for extant ...
The four primary axes of Stigmaria dichotomize often, forming an extensive underground system possibly ranging up to 15 m (49 ft) in radius. The rootlets range in size, being up to 40 cm (16 in) long and 0.5–1 cm (0.20–0.39 in) wide, and typically taper distally and do not dichotomize.
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The forking of the bundle system starts near the base of a terminal cone, which remains erect, of the sympodial development in certain branches. The last method is when "adventitious buds appear in the cortical tissue closely connected with the stelar system of the trunk, and these buds continue their development like typical stems".
Polypodiales are unique in bearing sporangia with a vertical annulus interrupted by the stalk and stomium. [2] These sporangial characters were used by Johann Jakob Bernhardi to define a group of ferns he called the "Cathetogyratae"; [3] the Pteridophyte Phylogeny Group has suggested reviving this name as the informal term cathetogyrates, to replace the ambiguously circumscribed term "polypods ...
This project is intended to create accurate and dependable articles on the Monilophytes and the Lycophytes.. Principles include: Adherence to cladistic principles; Titling of pages according to scientific, not common, names
Archegoniatae was a higher taxonomic term that indicated those embryophytes having a female sexual organ in the form of an archegonium.The term was first introduced by the Russian botanist Ivan Nikolaevich Gorozhankin (1848–1904) in 1876 to indicate a division including bryophytes, pteridophytes and gymnosperms in contrast to the Gynoeciatae (Angiosperms) with a more complex female organ.