Dryopteridaceae of Maine
(Kingdom Plantae, Monilophytes)


a project of
V. F. Thomas Co. - 167 Thorne Mountain Road - Canton, Maine  04221
info@vfthomas.com


(updated 28 January 2020)


Dryopteridaceae - wood fern family
[information to be added]

Maine is home to 11 species in 2 genera (hybrids excluded). If you already know which species you have or are interested in learning about, click on the appropriate species link below. Otherwise, to determine which genus that the plant in question falls into, refer to the table immediately below the species list.
   Dryopteris (9 species)
      Dryopteris campyloptera - mountain wood fern
      Dryopteris carthusiana - spinulose wood fern
      Dryopteris clintoniana - Clinton’s wood fern
      Dryopteris cristata - crested wood fern
      Dryopteris filix-mas ssp. brittonii - male wood fern
      Dryopteris fragrans - fragrant wood fern
      Dryopteris goldiana - Goldie’s wood fern
      Dryopteris intermedia - evergreen wood fern
      Dryopteris marginalis - marginal wood fern
   Polystichum (2 species)
      Polystichum acrostichoides - Christmas fern
      Polystichum braunii - Braun’s holly fern




auricle at base of leaflet/leafule indusium attachment char. 3 char. 4 char. 5 char. 6
Dryopteris absent laterally
Polystichum present peltate (attached at center)


Dryopteris (wood fern)
[information to be added]

red font = character state unique or nearly so aromatic glands on leaf blades indusia bristle-tipped teeth on leaf segments sorus location leaf persistence leaflet orientation
D. campyloptera absent separate present between margins and midrib of leaf segments dying back in winter in plane of blade
D. carthusiana absent separate present between margins and midrib of leaf segments dying back in winter ± in plane of blade
D. clintoniana absent separate present between margins and midrib of leaf segments fertile leaves dying back in winter; sterile leaves green through winter at oblique angle to plane of blade
D. cristata absent separate present between margins and midrib of leaf segments fertile leaves dying back in winter; sterile leaves green through winter perpendicular to plane of blade
D. filix-mas ssp. brittonii absent separate absent between margins and midrib of leaf segments dying back in winter ± in plane of blade
D. fragrans present often overlapping absent between margins and midrib of leaf segments green through winter ± in plane of blade
D. goldiana absent separate absent between margins and midrib of leaf segments dying back in winter in plane of blade
D. intermedia absent separate present between margins and midrib of leaf segments green through winter ± in plane of blade
D. marginalis absent separate absent at/near margins of leaf segments (blue-)green through winter ± in plane of blade

Dryopteris campyloptera (mountain wood fern) - [information to be added]

Dryopteris carthusiana (spinulose wood fern) - [information to be added]

Dryopteris clintoniana (Clinton’s wood fern) - [information to be added]

Dryopteris cristata (crested wood fern) - [information to be added]

Dryopteris filix-mas ssp. brittonii (male wood fern) - Maine’s rarest Dryopteris species.

Dryopteris fragrans (fragrant wood fern) - [information to be added]

Dryopteris goldiana (Goldie’s wood fern) - [information to be added]

Dryopteris intermedia (evergreen wood fern) - [information to be added]
habit (lower left); adaxial surface of leaf (lower right)
   
(click on an image to enlarge)

Dryopteris marginalis (marginal wood fern) - [information to be added]
habit (lower left); adaxial surface of leaf (lower right)
      
(click on an image to enlarge)

abaxial surface of leaf (lower left); close-up of abaxial surface of leaflet showing marginal sori (lower right)
   
(click on an image to enlarge)


Polystichum (Christmas fern)
[information to be added]

leaf division fertile leaflets sori distribution char. 4 char. 5 char. 6
P. acrostichoides once reduced in size compared with sterile leaflets often confluent
P. braunii twice same size as sterile leaflets distinct

Polystichum acrostichoides (Christmas fern) - habit (lower left): adaxial surface of reproductive leaf, the sori being on the abaxial surface of the reduced leaflets (at distal end of leaf (lower right)
   
(click on an image to enlarge)

scales on leaf petiole:

(click on image to enlarge)

Polystichum braunii (Braun’s holly fern)


Note:
   1. Taxonomy and nomenclature follow Flora Novae Angliae by Arthur Haines (2011, Yale University Press, ISBN 978-0-300-17154-9).