Bryophyten. — Ptcridoph3'ten. 589 



seiner Sp/ia^;Nii7n- Arien , insbesondere gegen die Zerlegung des Sph. 

 tiiygidu})! in drei Teile und die Umtaufung RöU'scher Splingtia. 



W.^Herter fBerlin-Steglitz). 



Roll, Ueber die Warnstorfsche Stichproben-Methode. 

 (Hedwigia. LIII. p. 148-150. 1913.) 



Es kommt bei Torfmoosen häufig vor, dass in demselben Rasen 

 zwei oder mehrere habituell vollkommen ähnliche Formen verschie- 

 dener Formenreihen zusammen wachsen. Sei es blosser Similismus, 

 der durch den Kampf ums Dasein hervorgerufen wird, oder eine 

 gegenseitige Anpassung, die diese Mimikry erzeugt, die Tatsache, 

 dass habituell ähnliche Moose gern im demselben Rasen wachsen, 

 ist unbestritten. 



Verf. erklärt hiermit dem Umstand, dass Warnstorf bei 

 seinen Stichproben unter den Exemplaren des nordamerikanischen 

 Sph. Wilsoni var. quinquefariian Rl, auch Teile von Sph. aciitifolium 

 Ehrt, und Sph. robustuni Rl. fand. 



In etwas gereiztem Tone wendet sich Verf. sodann gegen die 

 Methodik VVarnstorfs, der u. a. zu Recht bestehende Varietäten 

 in Formen mit Dahintersetzung seines eigenen Namens umtauft. 



W. Herter (Berlin-Steglitz). 



Bower, F. O., Studies in the Phj'logeny ofthe Filicales. 

 III. On Metaxya and certain other relativelj'' primitive 

 Ferns. (Ann. of Bot. XXVII. 107. p. 443-477. 3 pl. July 1913.) 



This paper deals with the anatomy of Metaxya Presl., Hemitelia 

 setosa (Klf.) Mett., Cyathea niexicana Schlecht. & Cham., Cibotnan 

 Baroviets and Thyrsopteris. The rhizome of the monotypic Metaxya 

 is provided with a solenostele resembling that of the horizontal 

 runner of Lophosoria, but thinner. The protoxylem is not clearly 

 defined. The leaf-trace is a Single curved bündle consisting, when 

 füll sized, of 20—30 divergents. Related to some of the leaves are 

 branches whose vascular supply is solenostelic from the first and 

 is attached as an open arc to the abaxial side of the trace, so that 

 the pith of the bud is continuous whith that of the main axis. A 

 small Underground runner of Hemitelia setosa also had a solenostelic 

 vascular structure and at the point of junction with the main stele 

 it remained open, so that here, too, the pith of the brauch and that 

 of the axis were continuous. The stele of this runner, however, as 

 well as that of a larger dictyostelic runner differed from the sole- 

 nostele of Metaxya in possessing a medullary System of vascular 

 Strands. The buds of the soboliferous Cyathea mexicana, too, are 

 solenostelic and so, according to Stenzel's observations are those 

 of Alsophila aciileata. Cibotitini Barornets, though dictyostelic, has 

 been shown by Gwynne Vaughan to be very near solenostelj' 

 and the present investigations show that its runner possesses a 

 solenostele, though at the base of the branch pith and internal 

 endodermis disappear owing to contraction; thus the stele has 

 locally a m.ore primitive structure than LopJwsoria or Metaxya. In 

 Thyrsopteris the small runners ma}' have a simple solenostele, but 

 the larger axes are polycyclic, the medullary Strands forming a 

 compensating S3'stem. 



The soral characters of numerous ferns are also considered and 



