The Botany of Iceland - 01.12.1942, Blaðsíða 108
334
M. P. CHRISTIANSEN
curvum, sat abrupte attenuatis, o—pauci-dentatis, lobo terminali triangulari-hastato,
obtuso—acutiusculo, integro, lobulis basalibus brevibus, breviter acutis.
Scapi + colorati, sat dense araneosi.
Involucrum 11 X 18 mm, sat obscure viride, basi subturbinatum. Squamae
exteriores plurimae (26), laxe patentes—reflexae, 4.0—2.5 X 14-—15 mm, lineares,
subtus laete olivaceo-virides, + brunnescentes, supra laete virides, paulo purpureae,
+ pruinatae.
Calathium c. 50 mm latum, sat obscure luteum, planum—convexulum, valde
radians. Ligulae marginales, 2.3 X 18 mm, subtus stria cano-violacea notatae.
Antherae polliniferae.
Stigmata virescentia—atro-viridia.
Achenium 3.8—4.0 mm longum, c. 1.2 mm latum, brunnescens, paulo rubescens
(153—138—134), superne latius, longe et robuste spinulosum vel squamulosum,
ceterum laeve—tuberculatum, in pyramidem 0.6—0.8 mm longam, subcylindricam,
1—2-spinulosam abiens. Rostrum 10—11 mm longum.
T. longispinulosum has somewhat rose—bright purple-coloured petioles, yellowish-
green, regularly lobed leaves, lobes often with a somewhat abrupt point, a short
triangular—hastate terminal lobe, large heads, patent—slightly recurved, long outer
bracts, and a brownish—reddish fruit with long spines. It may be mistaken for
T. galeiþotens, but the latter when typical has narrower and longer lobes and +
purple-spotted, vivid and dark yellowish-green, somewhat lucid leaves. See also
T. scabrum, which has outer leaves of the same type as T. longispinulosum.
Habitat: Home-fields.
Localities: Vestmannaeyjar !, 5.VII.1935. S.—Hveragerði !, 2.VII.1937, Reykir
at Álafoss !, 29.VI.1937. S.W.—Flatey in Breiðifjörður, 10.VII.1935. W.—Patreks-
fjörður, 11.VII.1935, fr., phot. N.W.
108. Taraxacum chloodeum M.P.Chr. n. sp.
Spec. orig.: Iceland, Húsadalur in Þórsmörk, 8.VII.1937, leg. M. P. Christian-
sen. Plate IX, fig. 108. Plate XXXXII, fig. 212.
Planta sat robusta, 25—35 cm alta. Folia dilute lutescenti-viridia, parce araneosa,
petiolis sat latis—angustis, lucide purpureis, nervo mediano purpureo—pallido. Folia
exteriora anguste lanceolata, parum profunde lobata, lobis 2—3 utrinque, latis,
brevibus, deltoideis, patulis, acutis, o—pauce denticulatis, antice leviter concavis,
lobo terminali mediocri, sat hastato, supra lobulos basales + contracto, in apicem
late lingulatum, mucronatum protracto. Folia interiora lingulato-lanceolata, integra
et valde et acute patulo-dentata vel lobulata, margine inter dentes subulato-
dentato.
Scapi inferne rosei, sursum + brunnescentes.
Involucrum basi truncatum. Squamae exteriores 3.5—2.0 X 10—12 mm, subtus
obscure olivaceo-virides, + purpureo-marginatae, supra laete virides, + purpuras-
centes.
Calathium c. 50 mm latum, sat planum, radians. Ligulae marginales longae,
subtus stria cana—leviter purpurea notatae.
Antherae polliniferae.
Stigmata virescentia.
Achenium fusco-stramineum—brunnescens (162—129), c. 3.7 mm longum, c.
1.2 mm latum, supeme valde et robuste spinulosum, ceterum tuberculatum—laeve,
in pyramidem c. 0.9 mm longam, subcylindricam, infeme + spinulosam abiens.
Rostrum c. 12 mm longum.
T. chloodeum has lucid purple-coloured petioles and yellowish-green, + shining
leaves. The outer leaves are lanceolate with few, short, broad, acute and patent