Hitherto, the following papers have been published: 



1. Ericineæ (Ericaceae, Pirolaceæ), 



1. Morphology and Biology. By Eüg. Warming.. p. 1 — 71. 



2, The biological anatomy of the leaves and of 



the stems. By Hknning Eiler Petersen p. 73 — 138. 



2. Diapensiaceæ. Diapensia lapponica L. By Henning 



Eiler Petersen p. 139 — 154. 



3. Empetraceae, Empetrum nigrum L. ByA.MENTZ.. p. 155— 167. 



