428 Floristik und Systematik der Phanerogamen. 



bracteoles, in wliich the single flowers are wrapped up); Actinotus Gib- 

 bonsü F. V. M. var. Beuerlenii n. var. (differs in the shorter fruit-hairs 

 with a large apical gland and in the persistent short- and broad- 

 lobed calyx with branched hairs) ; Helichrysum Boormanü n. sp. (near 

 H. collinum DC); Stylidiiim debile F. v. M. var. paniculatum n. var. 

 (calyx-lobes longer and narrower and capsules shorter and broader than 

 type; inflorescence paniculate, the lower branches often above 1 in. 

 long) ; Prostanthera granitica n. sp. (near P. rhombea R. Br., but dis- 

 tinguished by the absence of glands, the ovate-lanceolate leaves, and 

 the calyx-lips^ which are nearly equal in length and breadth and nearly 

 equaily pubescent); Glochidion iimbratile n. sp. (characterised by a 

 succulent fruit) ; Casuarina distyla Vent. var. prostrata n. var. (charac- 

 terised by the low, decumbent habit). F. E. Fritsch. 



Mentz, A., Studier over danske Hedeplanters Oeko- 

 logi. I. Genista -T ypen. [Studies on ecology of 

 danish heath-plants. I. The Genista -Type.] (Bo- 

 tanisk Tidsskrift. XXVIl. 2. p. 153—201. 24 figures in the 

 text. Copenhagen 1906.) 



Heath is defined by the author as a land overgrown with 

 low and mostly evergreen wooden plants (smail shrubs and 

 suffrutices), forest-trees occurring only as thickets, and with 

 a Sandy soil covered by an acetously reacting humous layer, 

 but never by any considerable quantity of pure peat. Thus the 

 Calluna-marsh („Heidemoor") according to the author is an- 

 other formation, the soil being peaty and bearing characteristic 

 species of plants (Sphagna, Eriophorum vaglnatiim). 



The author begins his studies on the ecology of heath- 

 plants by the present account on the Genisfa-iype, arranging 

 the species belonging to this type as follows: 



A. Only long-shoots (with long internodes), vegetative and floral: 

 Genista tinctoria. 



B. Both long-shoots and short-shoots. 



a. Only the short-shoots are floral. 



1. No spinöse branches. Floral short-shoots developed 

 from buds on the long-shoots of the preceding year: 

 Sarothaniniis scopariiis. 



2. Spinöse branches developed from buds on the vege- 

 tative long-shoots. Floral short-shoots developed from 

 accessory buds below the spinöse branches of the 

 preceding year: Genista germanica. 



b. Both floral short- and long-shoots. 



1. No spinöse branches. Floral short-shoots developed 

 from buds on long-shoots from the preceding year: 

 Genista pilosa. 



2. Spinöse branches developed from buds on vegetative 

 er floral long-shoots. Floral short-shoots from acces- 

 sory buds below the spinöse branches of the preceding 

 year : Genista angtica. 



Sarothamnus ^ Genista tinctoria and G. germanica are 

 suffrutescent, the upper part of the long-shoots perishing during 

 the winter. The branches of G. angtica and G. pilosa are per- 



