The Genus Asplenium in Vermont

Research on the genus relevant to Vermont

Bouharmont, J.  1972.  Meiosis and fertility in apogamously produced produced diploid plants of Asplenium trichomanes.  in Darlington, C. D. & K. R. Lewis eds.      Chromosomes Today  vol. 3, pp 253-258.
Charette, L. A. 1964. Camptosorus rhizophyllus forma boycei C. L. Wilson. Amer. Fern J. 54: 147-148. 
Fernald, M. L. 1928. American representatives of Asplenium ruta-muraria. Rhodora 30: 37-43.
Wagner W. H. Jr. 1954. Reticulate evolution in the Appalachian aspleniums. Evolution 8: 103-118.
Moran, R. 1982. The Asplenium trichomanes complex in the United States and adjacent Canada. Amer. Fern J. 72: 5-11. 
Walter, K. S., W. H. Wagner, Jr., and F. S. Wagner. 1982. Ecological, biosystematic, and nomenclatural notes on Scott’s spleenwort, × Asplenosorus ebenoides. Amer. Fern J. 72: 65-75.
Werth, C. R., S. I. Guttman, & W. Hardy Eshbaugh.  1985a. Electrophoretic evidence of reticulate evolution in the Appalachian Asplenium complex. Syst. Bot. 10: 184-192.
Werth, C. R., S. I. Guttman, & W. Hardy Eshbaugh.  1985b. Recurring origins of allopolyploid species in Asplenium.  Science 228: 731-733.
Wilson, C. L. 1935. A new form of walking fern. Amer. Fern J. 25: 18. 

Arthur Gilman's treatment of the genus for Vermont


 1. A. montanum
Willd.  MOUNTAIN SPLEENWORT.  Rare, only one site; dry

            talus and ledges. Pownal, cliffs above Rattlesnake Brook (Jenkins).

 2. A. platyneuron
(L.) B.S.P.   EBONY SPLEENWORT.  Frequent; ledges and dry banks, especially on limestone outcrops. Mostly in western Vt. and north in the Ct. River Valley to Barnet; an outlying station at Coventry (Winslow).

 3. A. rhizophyllum
L.   WALKING FERN.  Frequent on shaded, mossy limestone outcrops and boulders; rare east of the Green Mtns.

 4. A. ruta-muraria
L.   WALL RUE.  Occasional; dry, shaded limestone outcrops. Only west of the Green Mtn.s except outliers at Quechee Gorge and Willoughby.

 5. A. trichomanes

            a. ssp. trichomanes   MAIDENHAIR SPLEENWORT [diploid].

            Occasional; epipetric on non-calcareous substrates such as quartzites, ultramafics (serpentine), etc. but seems not to be on granite.

          b. ssp. quadrivalens D. E. Meyer emend. Lovis   MAIDENHAIR SPLEENWORT [tetraploid].  Frequent; epipetric on shaded limestone and calcareous schist outcrops.

 6.  A. viride
Huds. GREEN SPLEENWORT. Rare; subalpine calcareous cliffs, mt. Mansfield, Smuggler’s Notch, Willoughby. Also an anomalous lowland forested site (still on limestone) in Plymouth. Listed as threatened.






 1. A. platyneuron ×
rhizophyllum = A. × ebenoides R. R. Scott.  SCOTT’S SPLEENWORT.  Rare, with parents. Champlain Valley only.


 2. A. ruta-muraria × trichomanes
ssp. quadrivalens = A. × clermontiae Syme.

            MISS WOOLSON’S SPLEENWORT.  Very rare; dry outcrops. Only once collected in Vt.: Proctor (Woolson), and only one other North American collection known (Ohio).

 3. A. trichomanes
ssp. trichomanes × trichomanes ssp. quadrivalens =

            A. trichomanes nothossp. lusaticum D. E. Meyer. Triploid hybrid; rare, with parents.