In German linguistics, the Benrath line (German: Benrather Linie) is the maken–machen isogloss: dialects north of the line have the original /k/ in maken (to make), while those to the south have the innovative /x/ (machen). The Line runs from Aachen in the west via Benrath (south of Düsseldorf) to eastern Germany near Frankfurt an der Oder in the area of Berlin and Dessau and through former East Prussia dividing Low Prussian dialect and High Prussian dialect. It is called Benrath line because Benrath is the place where it crosses the Rhine.
The High German consonant shift (3rd to 9th centuries AD), in which the (northern) Low German dialects for the most part did not participate, affected the southern varieties of the West Germanic dialect continuum. This shift is traditionally seen to distinguish the High German varieties from the other West Germanic languages.
The impact of the High German consonant shift increases gradually to the South. The Benrath line does not mark the northernmost effect of the High German consonant shift, since the Uerdingen line, the ik–ich isogloss, lies slightly further north; and some of the peripheral changes associated with the shift did affect Low German.
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Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction