The polytrichum SP are not widespread on land because the conditions on land do not favor them to grow. In a nutshell, the Polytrichum SP cannot thrive on land.
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antartica
The gametophyte of Marchantia, a liverwort, is typically flat and thallose, forming a lobed structure that grows close to the ground, whereas the gametophyte of Polytrichum, a moss, is upright and stem-like with distinct leaves. Marchantia reproduces asexually through structures called gemmae, while Polytrichum primarily reproduces sexually with more pronounced reproductive structures. Additionally, Marchantia often has a more complex life cycle with a prominent sporophyte generation that is dependent on the gametophyte, while Polytrichum has a more independent sporophyte that can grow taller and more robust.
Hair-cap mosses comprise the genus Polytrichum of the order Polytrichales. Both the genus and common name of these mosses make reference to the hairy calyptracharacteristic of the sporophyte capsules (sporangia)
nomadic herding
Alaska.
Antarctica has the highest proportion of land with no widespread use, as it is covered by ice and snow, making it inhospitable for human habitation and agriculture.
nomadic herding
algae, moss, liverwort, hornwort
Plantae Bryophyta Musci Polytrichaceae Polytrichum
Navicula sp.,Cymbella sp., Melosira sp.,Asteromphalus sp.
The number 5 is used as a spacer (sp) in the sequence. 3-sp-4-sp-5-sp-6-sp-7-sp.....