The Botany of Iceland - 01.12.1942, Page 88

314
M. P. CHRISTIANSEN
pureo-maculata, plana, fere glabra, longa, lingulata—lingulato-lanceolata, sat parum
lobata, petiolis angustis, pallidis—sat purpureis, nervo mediano ad medium paulo
purpureo-brunnescenti, lobis 6—9 utrinque sat distantibus, a basi latis, triangulari-
deltoideis, in apicem patentem, acuminatum attenuatis, antice sigmoideis—concavis,
superioribus integris, inferioribus denticulatis, lobo terminali fol. exteriorum brevi,
triangulari-hastato, integro, fol. intermediorum et interiorum longo, late hastato, +
grosse dentato.
Involucrum ovato-ellipsoideum, basi leviter turbinatum, dilute viride, apice
obscuro.
Squamae exteriores laxe erecto-recurvatae, 2.0—3.5 X c. 14 mm, lineari-lan-
ceolatae—lineares, subtus sat obscure olivaceo-virides, supra laete virides, interiores
apice obscuro.
Calathium magnum, c. 60 mm latum, valde convexum, saturate luteum. Ligulae
interiores + canaliculatae, marginales planae, c. 2.8 X 21 mm, subtus stria olivaceo-
vel luteo-purpurea notatae.
Antherae sat obscure, + brunneo-striatae, valde polliniferae.
Stigmata luteo-virescentia.
Achenium sat rubro-lateritium (103 D—142), longum et angustum, 3.8—4.0 mm
longum, c. 1 mm latum, superne sat late, acute, patenter spinulosum, ceterum tuber-
culatum—laeve, in pyramidem 0.8—1.0 mm longam, anguste cylindricam, basi saepe
spinulosam abiens. Rostrum 9—11 mm longum.
T. rubellum has long, narrow leaves, plentifully blotched with purple and with
many lobes; large, light heads, and long, narrow, red fruits. It differs considerably
from all other spotted species and is probably closely related to T. acromaurum
Dahlst.
Habitat: Ditches.
Localities: Varmahlíð, 16.VII.1937, in quantity, fr., phot. N.
Geogr. Distr.: Only found in Iceland.
Intacta.
84. Taraxacum nematosquameum M.P.Chr. n. sp.
Spec. orig.: Iceland, Siglufjörður, 30.VII.1937, leg. M. P. Christiansen. Plate
VII, fig. 84. Plate XXXV, fig. 190.
Planta mediocris—sat magna. Folia laete griseo-viridia, sat valde araneosa,
petiolis alatis—sat latis, pallidis, nervo mediano pallido— + brunnescenti. Folia
exteriora lingulato-lanceolata—lanceolata, parum et regulariter lobata, lobis 3—5
utrinque, brevibus, sat approximatis, deltoideis, acutis, patulis vel leviter hamatis,
integris—denticulatis, lobo terminali parvo—sat mediocri, triangulari-hastato vel
sagittato. Folia intermedia et praesertim interiora obovato-lanceolata, profunde lobata,
lobis sat distantibus, sat angustis, + longis, acutis, patulis vel plerumque sat porrectis,
+ dentatis, lobo terminali brevi, late hastato, supra lobulos basales saepe grosse et
robuste dentato, mucronato.
Scapi folia superantes, + brunnescentes.
Involucrum laete viride. Squamae exteriores lineares, laxe patentes, 2.5—2.0 X
11—14 mm, subtus olivaceo-virides, + anguste albo-marginatae, supra laete virides,
apice dilute purpureo.
Calathium c. 50 mm latum, planum, sat radians, laete luteum, ligulae marginales
c. 2.5—18 mm, subtus stria dilute cana—cano-rosea notatae.
Antherae luteae, parce polliniferae.
Stigmata lutea.