Polytrichum commune is a common moss of sunny places. A great place to find it is up on Cypress Mountain along the roadsides.

Stem cross-section:

And another:

A closer look:

Leaf cross-section:

A cross-section of the leaf through the costa. Note the lamellae.

Prepared slide of a leaf cross-section:

Sporophyte:

A prepared slide of a longitudinal section through the sporangium.

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