6 STRUCTURE AND LIFE-HISTORY OF HAY-SCENTED FERN. 



Schkuhr (1809, p. 125, plate 131) referred to this fern as Dicksonia 

 bubescens* He has been followed only by Presl (1836, p. 136). 



Desvaux (1827) made this species the type and only member of his 

 g-enus Sitobolium. His diagnosis of the genus reads: "Sori globosi; in- 

 volucrum fornicatum globulosum a basi ad apicem dehiscens" (pp. 262, 

 263). No specific diagnosis is given. t J. Smith (1841) changed the 

 spelling 1 to Sitolobium, and Newman's text (1851) gives Litolobium. G. 

 Kunze writes thus in Linnaea (23:249): Sitobolium (male Sitolobium)," 

 but in 1848 the printer makes him say "Litolobium (not Sitolobium)." 

 Link's (1841) g-enus Adectum\ is too late ever to be more than a synonym. 

 The identity of the plant, however, has never been in doubt, for it stands 

 absolutely unique amid its native surroundings. The list of synonymy 

 on page 45 will serve to show how the name has been bowled about. 



Its gfeneric affinities are briefly discussed on page 42. We will simply 

 state that its place is at present established in Bernhardi's (1800) genus 

 Dennst&dtia (type: D.flaccida= Trichomanes flaccidum Forst.), and we 



*On plate 131 marked Dicksonia pubescens. Text on p. 125 reads: 



II. DICKS. ^pubescens in margin of page] frondibus subtripinnatis, foliolis lanceo- 

 latis, pinnis oblongis, laciniis ovatis dentatis, stipite glabro, rachi pubescente. Sw. 

 Mohr. in Litt. 



Nephr odium punctilobuhim, maiusculum; stipite nudo, ramis pinnulisque pubescen- 

 tibus: fronde longa, bipinnata; pinnulis decurrentibus, subovali-oblongis, semi et ultra 

 pinnatifidis; lobulis oblongiusculis, apice 2-4-dentatis, singulis unipunctiferis. Mich. 

 Flor. Bor. Amer. n. p. 268. 



Habitat in Canada. Habitus Polypod. filic. fern. Mich. 



Weichhaariger Dicksonischer Farn. Mit fast 3-mal gefiedertem Laube, lanzet- 

 fdrmigen Blattern, langlichen Blattchen, eyrunden, gezahnten Lappen, glatten Strunke 

 und eine weichhaarigen Spindel. 



Dieser Farn erhielt ich stiickweise aus Pennsylvanien auch unter Polypodium pilo- 

 siusculum Willd., wonach ich zwar die eigendliche Grosse nicht, aber nach dessen 

 Theilen doch die 3-fache Fiederung erkennen kann. . . . [The next paragraph de- 

 scribes the plate, closing with the words] Alle Rippen der Blattchen and Lappen sind, 

 wie die Spindel, mit gegliederten Haaren bekleidet. 

 tDesvaux's full text reads: 



SITOBOLIUM N. Sori globosi; involucrum fornicatum globulosum a basi ad apicem 

 dehiscens. 



i. S. punctilobum N. Nephrodium punctilobum Mich., Fl. am. bor., n, p. 268. 

 Aspid. punctilobum Sw., Syn. t p. 60. Dicksonia pilosiuscula Willd., En. hort. ber., p. 

 1076. Dickson. pubescens Schk., Fil., t. 131. 



J Link's full text is as follows: 



ADECTUM. 



Frons tripinnatisecta. Sori subrotundi marginales ad sinus frondis. Indusium 

 undique ad sorum adnatum eumque tegens, demum medio dehiscens et circulare. 



A. Dicksonia defectu sporidochii valde differt. 



i. A.pilosiusculumiv. tripinnatifida, pinnellis brevibus, antice et superne incisis, 

 stipite rhachi costisque pubescentibus. 



D. Fr. 1-2 ped. alta, pinnae 3 poll. Igae., pinnulae 3 lin. Igae. 



Dicksonia pilosiuscula W. sp. 484. W. E. 1076. ^.^.2.464. H. b. 2.10. Raddi 

 bras. 63. Dicksonia pubescens Schkuhr kr. 125 /. 132. 



Hab. in sylvis opacis ad rupes Pennsylvaniae et Virginiae nee non in locis montosis 

 prope Tejuco Brisiliae. Perenne. [p. 72.] 



