Prothallium (prothallus) — the gametophyte of the wood fern genus Aspidium

Aspidium is an obsolete taxonomic group from the family Dryopteridaceae, with its species now reclassified among other genera including Tectaria (Tectariaceae)

The vast majority of these illustration plates are from a plant systematics wall chart series – the Dodel-Port Atlas – released between 1878 & 1883”

via: http://bibliodyssey.blogspot.com/2012/12/plant-anatomy-charts.html

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