Historical clue formulations

• Some rock coverings — 2019-01-02
• Flowerless plants — 2018-01-18
• Bryophytic growths — 2015-05-13
• They may cover rocks — 2008-10-25
• Bryologists' study — 2006-11-30
• Bryologists' study — 2006-05-28
• Foxfeet and sphagnum — 1994-12-11