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



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

 t)i(t>fsccns* He has been followed only by Presl (1836, p. 136). 



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

 genus Sitoboliiun. His diagnosis of the genus reads: "Sori globosi; in- 

 volucrtmi fornicatum globulosum a basi ad apicem dehiseens" (pp. 262, 

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

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

 Kunze writes thus in Linneea (23:249): Sitoboliuin (mafeSitoIobium)," 

 but in 1848 the printer makes him say " ' Litolobiiim {not Sitolobimu )." 

 Link's (1841 ) genus . ldectum\ 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 generic affinities are briefly discussed on page 42. \Vc will simply 

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

 Dfnnst(cdlici (type: D. Jlaccida - 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. Siv. 

 Mohr. in Lift. 



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. Ainer. n. p. 268. 



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



Weichhaariger Dicksonischer Fani. Mit fast 3-mal getiedertem Laube, lanzet- 

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

 und eine weichhaarigen Spindel. 



Dieser Farn erhielt ich stiickweise aus Pennsylvanien auch voter Polypodiutn pilo- 

 siuscitluin 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, mil gegliederten Haaren bekleidet. 



tDesvaux's full text reads: 



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

 dehiseens. 



i. ^S". punctilobum N. Nephrodium punctilobum Mich., Fl. am. bar., 11. p. 268. 

 Aspid. punctilobum S\v., -Sj;/., p. 60. Dicksonia pilosiuscula Willd., En. Jiort. her., 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. Indnsium 

 undique ad sorum adnatum eumque tegens, dernum medio dehiseens et circulare. 



A. Dicksonia defectu sporidochii valde differt. 



i. A. pilosiusciilum fr. tripinnatifida, pinnellis brevibus, antice et superne incisis, 

 stipite rhachi costisque pubescent! bus. 



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



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

 bras. 6^,. 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.] 



