36 Isabel C. Cookson : 



commonly met with, there being either an increase or decrease 

 in the number. The parts of the corolla are the members most 

 usually affected, but one specimen noted had the floral formula — 



KcCeAe + gGo- 



Several examples of " Staminody of the Corolla " are given, 

 by Masters 2 and Worsdell 3 . As far as can be ascertained, how- 

 ever, the occurrence of partial staminody of the corolla in the 

 genus Eriostcmon, has not been previously noted ; this short ac- 

 count has therefore been deemed justifiable. 



The fact that more than one individual illustrated this occur- 

 rence, and that two are obviously younger, and so probably the 

 offspring of one of the larger ones, led me to think that this 

 phenomenon might recur from year to year. Such has proved 

 to be the case, for an examination of this year's buds has, in 

 every instance, shown the presence of the abnormality above de- 

 scribed. It therefore seems quite possible that these characters 

 are those of a variety of E. obovalis, which has developed from 

 the type as a mutant, but this fact can only be definitely deter- 

 mined by further observation and experiment. 



2. Glossodia. 



In the spring of 1919 two anomalous specimens of Glossodia 

 major, R. Br., were found, both of which were characterised by 

 the possession of two labella, as well as an abnormal arrangement 

 of the perianth segments. Mr. E. E. Pescott tell me that the 

 occurrence of two or more labella in the genus Glossodia, and the 

 allied genus Caladcnia, is of no very uncommon occurrence, a few 

 specimens being obtained each year; but, as far as can be ascer- 

 tained, very little attention seems to have been given to these 

 forms. 



Specimen A. — (Text fig. 3) the perianth segments are six* in 

 number, the three outer calyx lobes being very similar to the two 

 lateral corolla lobes, in size, shape and colour. The median an- 

 terior petal is in the form of a labellum, or " lip," which is bulged 

 and dilated, with the distal region purplish, tapering to a point. 

 The labellum bears a blunt, yellow appendage. 



Specimen B (Text fig. 3) was collected by Miss S. Altman at 

 Beaconsfield. It varies from the normal, firstly in the develop- 

 ment of a median flat petal (p. 3), quite indistinguishable from 

 the two paired petals, and secondly in the development of two 

 quite perfect labella, one on either side of the antero-posterior 



2 Vegetable Teratology, 1868, p. 298. 



3 Principles of Plant Teratology, 1916, vol. ii., pp. 153-156. 



