Viðbót til Hieracium-gróðurin í Føroyum: Supplemenl to the Hieracium-Flora of the Faeroes

Abstract

Lasí win^er (1953—54) I was asked to identify a number of Faeroese specimens of Hieracia belonging to the collection of Mr.
Rasmus Rasmussen, a former headmaster in Tórshavn. These ^specimens had been coljected bj him several years ago in various focalities in ,tihe Faeroes. I had never before studied species of Hieracia from rhe Faeroes, and therefore I felt tihe need for cornparative material, especially as examples 'belonging to tihe Faeroes species were not availahle i:i Iceland. The Botanical Museums of Stodkholm and Copenhagen did me fee great favour to letnd to me all their specimens of Faeroese Hieracia, and for tlhis I sihould like to express my most cordial thanks. 24 species of Hieracia are known from the Faeroes (Dahlstedt 1903). — Undoubtedly one of these species, viz. //. danicum Da'hlst. was lintroduced during recent times. — In the collection entrusted ito me I found 13 of ,the species previously described and also some doubt ful specimens. However, besides this, I found 6 mew species and one new variety. Among tlhese there is a fine example of a species belonging to tfae Alpina Section, íbut hitherto no species of tfais section ihas been recorded from Faeroes. This seems to stress the need for more detailed invesligations on the Hieraciumflora of .tlhe isles. The paper eontains original descriptions of the new species.

The type specimens are preserved in the collection of the Natural History Museum in Tórshavn, Faeroes. Alpina. H. Rasmussenii n. sp. (vide pag. 116), which belongs to Alpina Genuina, is a very interesting speoies as mo specimens of that Seotion have previously been found in tihe Faeroes.

Unfortunately it is represented foy one example only. Its further distribution is at presernt no,t known, and it is not po,:i3Íble to
evaluate its eventual variaibility. This new species is distinguished by its black glands, O'n the wihole etem, by its sm-all subentire radical leaves, tlhe sligihtly developied stem-leaves, the lack of bracts about tihe summit of tlhe stem, and iby its darkish and unusual long-pilose involucre.

Comparing the present specimen with Icelandic species of, this Section it does inol seem ito be closely allied ;to any of thase. As to tihe indumentum of tlhe oharaoteristic involucre k resemibles H. tamxacifrons O&karss. from W.-Iceland, and ithe shape of 'tihe radical leaves is very similar to hhat of H- percome Om., tmt in all other riespeols it differs essentially from t'hese two Icelandic Alpina. Vulgata. H. saxunense, n. sp. (vide pag. 117) is closely related to H. subcordijrons Daihlst. fout it differs from
that species ín faaving slenderer and lower growtfa, narrower and longer inmer radical leaves and a lower stem-leaf. All tfae leaves are of deeper green colour T pilose above, and witfaouit cordate Liase. Flhyllaries are narrower, more acuminate and conspicuously floccose. I faave compared many specimens of H. subcordijrons from different localities with the present specimens.

Buit as I have not been able ito find intermediate atages between them, I tlhink it justifiafole to raise llhe form mentioned to
a specific rank. Cerinthoidea. Hieracium haplodonlum n. sp. (vide pag. 119). This species is most closely allied to H. peramplijorrne Dahlst. and H. melanochrotum Dafalst. It differs mainly from tfaem iby having foroader and characteristic deltoid dentate radical leaves, wihich are more pilose above, tfae large obovate sfaaped lower stemleaf, 

by efloccose and more densely glandular involucres and longtootihed Hgules. Tridentata. H. nannocaulon n. sp. (vide pag. 120)
belongs undoulbtedly to the Section Tridentata and it is closely allied to H- epileucoides Dahlst. It is mainly distinguished from tíhat species by having mudh lower stem, ibright green, duraible and densely placed radical leaves, no teaves (only ibracts) a'bout tbe upper half of tlie síem, and by less 'hairy involucres and shoiter teeth of the ligules. In .l'he H. naninocaulon material I found 3 specimens somewihat different from the type. Wlhellher tíhey belong to anobher :new species of Tridentata or they are referable as a variety to H. nannooaulan I caji not rstate because of too scanty material. These specimens Ihave 2—3 radical leaves, 3—5 fairly well developed stem-leaves and longer teetlh of the ligules. They remind one of a new Ioelandic species: H. hologlossum Oskarss. from S.E.-Iceland, 'buí they can not 'be neferred to it. Hieracium stictopliorum, n. sp. ((vide pag. 121). Of tliis species only one specimen with undeveloped flowierheads is available. But as it ihas distinct features, I think it reasonalble
to describe it. H. stictophorum is dharacterized by nelatively large purpligh-lbrown-bloldhed radical Ieaves, one small stem-leaf,
fairly densely pilose and glandular peduncles and iby copiously microglandular iivolucres. The systematic place of tihis plant is
not perfeotly clear, but I Chink tihat it is in closest relation witih Tridentata, to wihioh Section I provisionally refer it. Among Faeroese species it comes nearest to H. epileucoides Dahlst., hut that species presents some essential points of difference from H. slictophorum e. g. as to ilhe foliage and t'he indumentum of tihe infloresceincje.

iBritiish and Icelandic Tridemtata spegies also differ widely from itihis new form. Alpestria. H. scolophjllum m. sp. (vide pag. 122), is undoubtedly closely allied to the Semidovrensia species H. Hartzianum Dahlst., but it diiffers from i,t in several particulars. Radical leaves are all acuminate—sufoulaite, never oibtuse, witihout stellate hairs and more densely pilose on their
surfaces; ,tlhe inflorescence is more qcntracted, wiith much shorter acladium, lower and more floccose involucres and darker styles. Hieracium Hartzianum. Dahlst. var. heteroglochin nova v. (vide p. 123). 3 specimeins of this form from same locality are ait hand, and tihese are of fairly different appearance. Judging from their general facies we migjht think that tihey were an intermediate form between H. Hartzianum Daihlst. and H. Ostenjeldii Dahlst. But  after ihaving investigated tlhem more closely, it is evident that they are more allied to H. Hartzianum. Therefore I have provisionally reíerred tlhem as a variety to that species. This variety differs from H. Hartzianum in its narrower and more irregularly itoothed radical leaves, in its smaller heads, lower involiucres, and in more sitellately hairy phyllaries. Perhaps this new form is of more independent nature than 1
suspect, Ibut only investigation on more material in order to compare it with H. Hartzianum can prove this.