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Geologie regionale Hogbom, A. G., Sveriges jord och grund. (The earth and ground of Sweden.) 230 pp. Lindblads forlag, Uppsala, 1927. Jessen, Knud, Det forhistoriska Europas naturforhallanden. (Die Naturverhaltnisse des vorgeschichtlich e n E u r o p a s.) 57 S. 18 Textfig. (Aus: De forhistoriska tiderna i Europa I, Stockholm 1927). Munthe, Henk., Hede, J. Ernhold och Lundqvist, G., Beskrivning till kartbladet Klintehamn. (Beschreibung zum Kartenblatte Klintehamn.) Sv. Geol. Unders. Ser. Aa. N:o 160. S. 1–109. Stockholm 1927. Munthe, H., Hede, J. E., och von Post, L., Beskrivning till kartbladet Hemse. (Beschreibung zum Kartenblatt e H e m s e.) Sv. Geol. Unders. Ser. Aa. N:o 164, 155 S., 93 Fig., 2 Karten, Stockholm 1927. von Post, L., Beskrivning till Oversiktskarta over sodra Sveriges myrmarker. (Beschreibung zur Ubersichtskarte uber die Moore Sudschwedens.) — Sv. Geol. Unders., Ser. Ba. N:o 11. Stockholm 1927. Sandegren, R., Beskrivning till kartbladet Luro. (Beschreibung zum Kartenblatte Luro.) — Sv....

(1930). Literature on Pollen-statisties published during the years 1927–1929. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 52, No. 2, pp. 191-213.

Tricolpate pollen grains, described in the present paper under the name Tricolpites (Eucommiidites) Troedssonii nova sporomorpha, occur regularly in the early Jurassic shale at Palsjo in northwestern Seania. Grains or spores of this particular type have only been met with among dicotyledonous plants. They do not, according to our present knowledge, occur in recent and fossil monocotyledons, chlamydosperms, gymnosperms, ferns, or mosses.

(1927). Literature on Pollen-statistics published before 1927. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 49, No. 2, pp. 196-211.

(1961). Cormophyte Spore Classification. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 83, No. 1, pp. 65-78.

(1955). Literature on Palynology. XVIII. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 77, No. 1, pp. 71-113.

(1944). Literature on pollen-statistics and related topics published 1940—1943. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 66, No. 2, pp. 256-276.

(1928). Studies in the postarctic history of the forests of Northwestern Europe. I. Investigations in the British Isles. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 50, No. 2, pp. 123-192.

Four phenomena were observed in a study of Populus tremula and P. tremula f. gigas microspores from before microspore mitosis through mature pollen which may have general significance in the ontogeny of pollen grains: 1) The exine and orbicules (Ubisch bodies) were covered by membranes. 2) The exine and the tapetal surfaces where orbicules form were covered by a polysaccharide (PAS positive) coat until after microspore mitosis; subsequently the tapetum became plasmodial. 3) Material having the staining characteristics of the nexine 2 (endexine in the sense of Faegri) accumulated on membranes in microspores in the space between the exine and the plasma membrane. That material was almost completely gone from the wall in mature pollen. The membranes on which material had accumulated migrated through the exine. Following passage through the exine these membranes were seen as empty fusiform vesicles in micrographs of anthers prepared by commonly used methods. 4) At about microspore mitosis when the cel...

(1932). Brittiska torvmarkstyper. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 54, No. 3, pp. 380-382.

The idea of an affinity between Aquilapollenites and the Loranthaceae published some years ago (Erdtman, 1963, p. 157) is dealt with in greater detail and with due consideration of new data presented by Srivastava & Rouse (1970). Appended is a note on the relationships—if any—between Gnetum and certain Loranthaceous taxa

Table I shows that two letters (S, N) and two figures (1, 2) can be used as symbols or “labels” instead of more or less complicated and/or ambiguous terms in labelling the main topographical and/or non-topographical sub-units or parts of angiosperm exine types (at least as far as present knowledge goes). Special attention has been paid to the characteristics of the nexine in Epilobium montanum believed to be “nexine-2” (N2) by Erdtman and others, albeit classified as “nexine-1, footlayer of the ektexine” by Rowley et al. (1970; p. 7).

(1932). »Unser Ostland». Geologiska Foreningen i Stockholm Forhandlingar: Vol. 54, No. 3, pp. 373-375.

(1932). Brittiska torvmarkstyper. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 54, No. 4, pp. 531-532.