Archive for November 2017

A New Look at Mosses

It is that time of year when the garden is done, the birds are gone, and nature’s palette is fading to a gray wash.  What’s a naturalist to do?  Delve into the mosses!  I will share with you what I have learned so far and point to a few resources that have been helpful guides in this new exploration.  Evolutionarily, mosses are primitive plants that are a step beyond algae but that lack the more sophisticated seed and flower structures that most plants use for reproduction.  People tend to like them, perhaps because of their diminutive size and soft feel, but they also sometimes confuse moss with molds, mildew, lichens, the closely related liverworts, and the distantly related clubmosses.  So what do you look for when examining what appears to be a moss?

Take an up-close look and see that the growing colony is made of individual strands or stems, closely packed together.  Your first step is to separate out one or more of these strands and to soak them for a few minutes to amplify their identifying features.  Then evaluate whether the single piece’s growth form fits into one of three categories:  

  • Acrocarps have stems that typically stand straight up, with sparse forks if any.  The stems are packed tightly together like tufts of carpet.
  • Pleurocarps have stems that tend to trail along the ground, branching freely and at wider angles.  The individual plants twine together to form mats.
  • Peat mosses have stems that stand upright and have branches in clusters of three or more that are often crowded at the tips.  They are said to resemble mop-heads.

Your next step is to examine the shape of the leaves on the single strand you are holding.  This will likely require a hand-lens (10x) or microscope.  You must use your relative judgement to decide whether the leaves are hair-like, lance, tongue, or sickle shaped, or ovate.  It’s okay if you can’t decide – I couldn’t either at first, so I scrolled through more sections of the identification guide than needed.  It gets easier with practice.

Pleurocarp with sickle-shaped leaf, no midrib: Hypnum cupressiform

The third step in helping to nail down an identification is to note whether the leaf has a midrib running down its center.  Again, this will require a sight aid for most of us. There are a limited number of species bearing each combination of growth form, leaf shape, and midrib, so these three steps should help you to narrow down your options to a handful of candidates.  Don’t be too quick to call the identity of your specimen – mosses are challenging and much of the fun is in experiencing them and teasing out their ambiguities.


Haircup moss

Rock cannikin moss







I found these five common species on a recent foray into the Eastwoods Preserve, where they should be visible all winter except when hidden under snowfall.

Pin cushion

Windswept broom moss

Pom pom sphagnum







I also found a few plants that were not mosses at all, although their names imply otherwise.  The two species are part of a group that is more closely related to ferns and would be found in identification guides to the ferns and their allies.  The last two are lichens, which are a symbiotic combination of algae with two kinds of fungi.  They are environmentally sensitive, like mosses, and are easily disturbed, so please tread lightly around these fascinating life forms.  

Tree clubmoss


A lichen

Mixed moss and lichens







Beyond identification is a an entire field of study on the functions of moss in the web of life and on our landscape.  While these primitive and ancient life forms have evolved enough defenses to be basically inedible, they have a long history as soil builders and environmental modifiers that help to stabilize ecology and provide a foothold for other lifeforms to thrive in otherwise barren places.  They also photosynthesize and store carbon (especially important in arctic regions), absorb rainfall and runoff lessening erosion, and serve as habitat refuges for small organisms.  Anthropogenically, they have proved useful for their antibacterial, antiviral, and antifungal properties in human medicine.  They are certainly worth a look!

Resources to recommend for beginning learners include:

Regional guidebook for identification:

Facebook group on Lichens, Mosses, Ferns and Fungi, with members from around the world, helpful with identification of lichens and mosses mainly:

Blog on mosses:





Guided Hike at Eastwoods Preserve

Sunday, November 12, 2pm.  We will practice tree and moss identification on this family-friendly hike along the one-mile loop trail at Eastwoods Preserve (link to map).  Eastwoods was purchased by the Town of Pound Ridge in 2009 and is maintained by a partnership between the Pound Ridge Conservation Board and the PRLC.  The forest is rich in Mountain laurel, ferns, moss and often mushrooms, giving it a fairly-land quality.  The trails are tighter and more twisting than most, a joy to hike on a fall day.  Please register with Krista at or call 914-205-3533.  Parking is limited at the Preserve parking lot at 134 Eastwoods Road, so please carpool if you can.


INVASIVE SPECIES SUMMIT: Restoration and Long-term Management


Please help spread word of this event to interested environmentalists and land managers.  PRLC’s Land Steward and Educator, Krista Munger, will attend.  If you live locally and would like to meet up with her for socializing during the lunch hour (usually with a bunch of other local plant people), you can email her at


Friday, November 3, 2017

10 a.m. – 4 p.m.

Invasive species are a major threat to biodiversity worldwide, second only to habitat loss. In this enlightening summit in Ross Hall, five experts share their hard-won insights about best practices to manage and restore ecosystems, and engage in audience conversation about how to establish goals, prioritize, take action to implement projects, and overcome challenges to achieve long-term success in both small- and large-scale sites.

Topics and Speakers:

Removal is Not (Usually) Enough!
Paddy Woodworth, award-winning Irish journalist and author of Our Once and Future Planet

Restoration Success in a Densely Urban Environment
Kristy King, Director of Natural Areas Restoration and Management for NYC Parks

So Many Weeds, So Little Time
Art Gover, Research Support Associate for the Penn State

Lessons from Urban to Suburban Environments
Tate Bushell, Director of Stewardship with the Westchester Land Trust
Jessica A. Schuler, Director of the Thain Family Forest at NYBG

Co-presented with Lower Hudson Partnership for Regional Invasive Species Management: LH PRISM logo

Link to NYBG Summit Website

Link to Registration