K. Krause: Eine neue Loranthacee aus Zentralamerika. 441 
subsimplex, vel ramis erectis vel adscendentibus, in plantis redundantibus, 
permaturis interdum late divaricatis vestitus, lineis pubescentiae longi- 
tudinalibus de foliis decurrentibus, praeterea glaber, 3—5 dm altus. 
Folia anguste usque lineari-lanceolata, 5—10 cm longa, 5—10 mm lata, 
ambobus extremitatibus angustata, sessilia, minutatim serrulata vel in- 
tegra, marginibus ciliatis, praeterea glabra. Inflorescentia paniculata, 
‚contracta. Involucrum 6—8 mm altum, 8—10 mm latum, bracteis eius 
in 4 series dispositis, lanceolatis, acutis, cilio- et scarioso-marginatis, 
praeterea viridibus. Flores radiati 25—35, 5—8 mm longi, pallide vio- 
laceo-purpurei vel albi. Pappus sordide albidus. — Species easily con- 
founded with this are A. lautus Lunell, which is best recognized by its 
widely spreading inflorescence; A. salicifolius Lam., which has thickish- 
broader leaves and the disk of the head 1 cm high and 1 cm broad, 
and white pappus; A. longifolius Lam., which has the bracts of the in- 
volucre glabrous, subequal, only the outermost sometimes shorter, and 
pale pappus; and A. laetevirens Greene, which has rather few heads, 
^ broader leaves, involucral bracts with white mid-rib, and outer bracts 
broader than the inner. — North Dakota: This species has a predi- 
lection for the margins of sloughs, The type specimen was collected 
by the writer on September 6, 1910, in high grass around a slough, not 
far from Leeds, Benson County. The plant is a representative of ad- 
vanced autumn, often defying the night frosts until early October, and 
‘surpassed in durability only by Brachyactis angustus. 
\ 
LXVIII. Eine neue Loranthacee aus Zentralamerika. 
Von K. Krause. 
e (Originaldiagnose.) 
Phthirusa Pittieri Krause, spec. nov. 
Rami teretes modice validi cortice griseo vel brunneo-griseo laevi 
vel hinc inde densiuscule lenticelloso obtecti. Foliorum petiolus supra 
tota longitudine latiuscule canaliculatus basi paullum  incrassatus, 
0,8—1,5 cm longus; lamina rigida coriacea anguste ovata vel ovato- 
oblonga apice acumine angusto acuto interdum paullum obliquo, 
1,5—1,8 cm longo praedita, basi rotundato-obtusa, 1,2—1,8 dm longa, 
tertio vel quarto inferiore 5—9,5 cm lata, nervis lateralibus 7—10 
supra prominulis subtus plerumque vix conspicuis angulo fere recto vel 
superioribus angulo acuto a costa validiuscula supra impressa subtus 
distincte prominente abeuntibus marginem versus arcuatim adscendentibus 
percursa. Inflorescentiae spicatae circ. 6—8 cm longae, in axillis foliorum 
plures collaterales. Flores dioici parvi brevissime pedicellati vel sessiles 
in glomerulos paucifloros 0,8---1,5 cm longe remotos dispositi. ‚ Calyculus 
brevis margine obsolete denticulatus. Tepala flavescentia vel in siccitate 
atro-brunnea crassiuscula subcarnosa oblonga dimidio superiore paullum 
