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 
genus Sifobolium. 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 to Sitolobium, and Newman’s text (1851) gives Litolobium. G. 
Kunze writes thus in Linnea (23: 249): Sitobolium (male Sitolobium),”’ 
but in 1848 the printer makes him say ‘‘Litolobium (not Sitolobium).’? 
Link’s (1841) genus .4dectumt 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. We will simply 
state that its place is at present established in Bernhardi’s (1800) genus 
Dennstedtia (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. 
Nephrodium punctilobulum, 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. M/zch. 
flor. Bor. Amer. 1. p. 268. 
Habitat in Canada. Habitus Polypod. filic. fem. Mich. 
Weichhaariger Dicksonischer Farn. Mit fast 3-mal gefiedertem Laube, lanzet- 
formigen Blattern, langlichen Blattchen, eyrunden, gezahnten Lappen, glatten Strunke 
und eine weichhaarigen Spindel. 
Dieser Farn erhielt ich stiickweise aus Pennsylvanien auch unter Polyfodium pilo- 
siusculum Willd., wonach ich zwar die eigendliche Grésse 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. 
1. 9. punctilobum N. Nephrodium punctilobum_ Mich., “7. am. bor., 1, p. 268. 
Aspid. punctilobum Sw., Syz., p. 60. Dicksonia pilosiuscula Willd., Ex. hort. ber., p. 
1076, Dickson. pubescens Schk., F7/., t. 131. 
tLink’s full text is as follows: 
ADECTUM. 
Frons tripinnatisecta. Sori subrotundi marginales ad sinus frondis. /adusium 
undique ad sorum adnatum eumque tegens, demum medio dehiscens et circulare. 
A. Dicksonia defectu sporidochii valde differt. 
1. A. pilostusculum fr. tripinnatifida, pinnellis brevibus, antice et superne incisis, 
stipite rhachi costisque pubescentibus. 
D. Fr. 1-2 ped. alta, pinnae 3 poll. lgae., pinnulae 3 lin. lgae. 
Dicksonia pilosiuscula W7. sf. 484. W. E. 1076. E. a. 2.464. Hl. 6. 2.10. Raddi 
bras. 63. Dicksonia pubescens Schkuhr kr. 125 ¢.132. : ; y 
Hab. in sylvis opacis ad rupes Pennsylvaniae et Virginiae nec non in locis montosis 
prope Tejuco Brisiliae. Perenne. [p. 72.] 
