Inaperturate Types

 

1. Grain pear shaped, three lateral poroids of broken exine and one on blunt end

Cyperaceae

1’ Grain spherical

2. Psilate or scabrate with intectate columellae

3. Grain 55-85 m, psilate

Larix laricina

3’ Grain < 50 m

4. Definitely scabrate with intectate columellae

Populus balsamifera, Populus grandidentata, Populus tremuloides

4’ Psilate (from loss of scattered gemmae)

Thuja occidentalis

2’ Verrucate, gemmate, or reticulate

5. Verrucate or gemmate, gemmae can be patchy or scattered

6. Grain 55-85 m, gemmae dense, edge of exine obscure

Tsuga candensis

6’ Grain < 50 m, edge of exine apparent

7. Gemmae crowded, persistent

Taxus canadensis

7’ Gemmae scattered, deciduous, patchy

Thuja occidentalis

5’ Reticulate

8. Reticulum broken

Potamogeton pectinatus, Potamogeton zosteriformis

8’ Reticulum complete

Potamogeton

 

NOT SORTED: Potamogeton gramineus, Potamogeton illinoensis