Hausmannia morinii

Name

Hausmannia morinii

Rank

Species

Generic Name

[Genus] Hausmannia

Authors (Pub.)

Stockey R. A. Rothwell G. W. Little S. A.  

Publication

Relationships among Fossil and Living Dipteridaceae: Anatomically Preserved Hausmannia from the Lower Cretaceous of Vancouver Island [2006/5]

Journal

International Journal of Plant Sciences

Volume

167

Issue

3

Page number

652

Year

2006

Fossil Status

foliage

Stratigraphy

Lower Cretaceous

Strat. comment

Valanginian-Hauterivian

Location

beach along Quatsino Sound, northern end of Vancouver Island, British Columbia, Canada

Paleoregion

America (North)

Data for Holotypus

Repository

University of Alberta, Department of Geology, Edmonton, Canada

Repository Number

P13148 A, B

Num

fig. 2a–2d, 2f; figs. 3, 4; fig. 5a, 5b

Pub.

Relationships among Fossil and Living Dipteridaceae: Anatomically Preserved Hausmannia from the Lower Cretaceous of Vancouver Island [2006/5]

Data for Paratypus

Repository

University of Alberta, Department of Geology, Edmonton, Canada

Repository Number

P13667 B; P13317; S59518 A-E; S59519 A-D; S59520 A, B; S59521

Diagnosis

Fronds with dichotomizing lamina, fan- to wedge-shaped, at least 9 cm long, 6.5 cm wide, margin crenate; teeth paired, 4–5 mm wide by 2 mm deep. Major veins, thick, dichotomizing at least six to eight times, decreasing in size toward frond margin, entering teeth, accompanied by internal adaxial and abaxial sclerenchyma. Secondary veins arising at angles of 90 forming square to rectangular to polygonal meshes. Tertiary and quaternary veins forming square to polygonal areolae 0.8–1.5 mm in diameter; areolae with freely ending veinlets. Adaxial epidermis of rectangular to polygonal cells with sinuous margins. Mesophyll of loosely packed parenchymatous cells. Abaxial epidermis of sinuous cells, uniseriate trichomes, and randomly arranged anomocytic stomata. Sporangia on abaxial surface in between veins, 8–12 (–13) per areola, scattered; distinct sori lacking; interspersed with uniseriate trichomes. Sporangia small, 110–130 mm 3 150–160 mm in diameter, with short sporangial stalk, two to three cells tall, four to six cells in transverse section. Annulus vertical, of eight to 10 cells, interrupted by stalk. Spores trilete, tetrahedral-deltoid, with concave sides; kyrtome on proximal surface, thicker near ends of laesurae; 18–25 mm in diameter; 32 per sporangium.