This weedy Polytrichid can be found within forests, along road banks and cliff ledges on dry, sterile and disturbed soil.
This moss is acrocarpous. It forms short or tall turfs. The plants are blue-green and unbranched.
The leaves of P. juniperinum have reddish tips and are strongly divergent when they are dry and .
A closer look at the leaves shows the clear laminar edges overarching the rest of the leaf.
A cross section of the lead will show the overarching lamina, enclosing much of the lamellae. It is also worth noting that the uppermost cells of the lamellae are smooth.
As seen in this picture, the perigonial rosettes (which houses antheridia and paraphyses) are red-tinged.
The antheridia, which contain sperm, have a sac-like appearance.
Here is an isolated paraphysis and the picture clearly shows that they are biseriate!
left: mature sporangium with operculum
right: slightly immature sporangium from a herbarium specimen
left: close-up of peristome teeth fused to epiphragm