Cytologie u. Befruchtung. — Morphologie u. Teratologie. 83 



Gefärbt wird in folgender Weise: 



1. Härten des lufttrockenen Präparates in Aethyl- oder schneller 

 (2-3 iVlin.) in Methylalkohol. Abtupfen mit Fliesspapier. 



2. Verdünnung der fertigen Farblösung mit Wasser unter Schütteln, 

 1 Tropfen in ca. 1 ccm. Wasser. Vorheriges Anwärmen des Wassers 

 auf 30-40" begünstigt die Färbung. 



3. Uebergiessen der Präparate mit der frisch verdünnten Lösung, 

 Färbedauer 10—15 Min., zur Noth auch nur 5 Min. Darauf Abwaschen in 

 scharfem Wasserstrahl, Abtupfen mit Fliesspapier, trocken werden lassen 

 und Einschluss in Kanadabalsam. Hugo Fischer (Bonn). 



Holm, Theo, Studies in the Gramineae. VIII. Miinroa sqaarrosa 

 (Nutt.)Torr. (Bot. Gazette XXXIX. p. 123— 136. f. 1 — 12. 

 Febr. 1905.) 



The plant is small, only a few inches high, of a bushy 

 habit with numerous short culms and leaves; the culms are 

 branched and bear several inflorescences. Each inflorescence 

 consists as a ruie of three spikelets of which the mediane shows 

 a structure soniewhat different from that of the two lateral. 

 The empty glumes are very unequal in the central spikelet, but 

 almost equal in the lateral; the flowering glume is piibescent 

 in both, but in the central there are three distinct nerves with 

 a tuft of long hairs at the base, while in the lateral the nerves 

 are not visible, and no long hairs are developed ; moreover the 

 apex of the flowering glume is long-awned and distinctly bi- 

 dentate in the mediane, but merely emarginate and short-awned 

 in the lateral spikelets. The texture is, also, different, since the 

 flowering glume and the palea are thin and membranaceous in 

 the mediane, but thick and coriaceous in the lateral spikelets, 

 thus the spikelets are to some extent dimorphic, even if the 

 flowers are perfect in both. 



The structure of the shoot is very complicated on account 

 of the profuse branching; however the lateral shoots begin 

 usually with a fore-leaf, which is two-keeled and two awned, 

 thus the lateral branches appear quite distinct. Some cases 

 of the mode of branching are iliustrated and described, and for 

 the further explanation of these must refer to the text. 



The histology of the various organs is, also, discussed, and 

 the plant shows a pronounced xerophilous structure. 



As regards the systematic position of Miinroa it seems to 

 be within the Festiiceae, but it is difficult to place it near any 

 of the genera so as to demonstrate its nearest affinity. Most 

 frequently the genus is placed next to Monanthochloe to which 

 it, however, shows no affinity. The peculiarity of the genus 

 seems to depend upon the dimorphism of the spikelets, and to 

 some extent upon the profuse development of shoots, especially 

 vegetative, in the axils of leaves near the apex of the culms, 

 a structure which is common in teratoiogical cases but which 

 is normal and constant in Miinroa sqiiarrosa. Theo Holm. 



6* 



