Observation 117004: Collema F.H. Wigg.

When: 2012-11-17

Collection location: Reserva de Vida Silvestre San Pablo de Valdés, Chubut Province, Argentina [Click for map]

-42.6849° -64.2464° 3m

Who: nastassja (Nastassja Noell)

No specimen available

Notes: Substrate: Soil amongst shrubs.

Habitat: Arid. Dunes, about 20m from shore. Underneath shrubs, particularly Chuquicaya avelloneda.

Description: wavy thick margins, large apothecia 1mm+ in diameter with rim (note that some of the more convex looking apothecia seems to be another species observation 11700.)

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By: nastassja (Nastassja Noell)
2012-11-17 11:09:15 EET (+0200)

Nearly all the Collema sp. that we found looked like this buried in sand specimen, which totally makes sense and kinda underlines that Collema and a certain moss are probably the earliest primary succession species. Which is amazing how great of a job they´re doing to have stabilized soil in an area that has not only had an intensive history of sheep grazing up until 7 years ago, but is in an area of active dunes, right near the shore, literally only about 20 m away, most of the wind blocked by a ridge of giant 10m high dunes, but it sure is windy, and sand blowing around quite alot! Amazing what these Collemas and that particular longer brown moss are doing. Once I have a paintbrush to wipe it clean…

Another that looks like C. tenax
By: Jason Hollinger (jason)
2012-11-17 10:10:10 EET (+0200)

Definitely looks like Collema in any case, unless there’s some other wacky genera down there we know nothing about! It’s so cool how it’s stabilizing the sandy soil, like it’s trying real hard to create a cryptobiotic soil crust, but grazing? wind? something is preventing it from reaching the minimum threshold coverage to start retaining enough moisture and nutrients to create a self-sustaining community.

Created: 2012-11-17 07:00:12 EET (+0200)
Last modified: 2012-11-17 10:07:31 EET (+0200)
Viewed: 38 times, last viewed: 2018-04-22 16:17:17 EEST (+0300)
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