1903- Phii,i,ips. — Notes on Arum maculahcm. 205 



any difference in soil or situation that would account for the 

 presence or absence of colouring matter in the leaves. 



The following is a list of the localities and habitats in which 

 1 have noticed it— several places around Cork ; roadsides 

 between Tipperary and Cashel (South Tipperary), Bally- 

 brophy and Krril, Abbeyleix and Durrow (Queen's Co.), Kil- 

 kenny and Callan, Thomastown and Graignamanagh, New 

 Ross and Graignamanagh (Co. Kilkenny), Cloughjordan and 

 Borrisokane, Borrisokane and Portumna (North Tipperary), 

 Portumna and Loughrea (Co. Galway) ; on a shady bank by 

 the Nore at Kilkenny ; in a w^ood at Graignamanagh ; and by 

 a wall and under trees in Portumna demesne. Some of the 

 Graignamanagh plants produced spotted spathes as well as 

 leaves. 



These records cover the occurrence of about sixty clumps. 

 T kept no record of the total number of green and spotted 

 clumps seen, but I have no hesitation in saying that the latter 

 would not amount to -J^y of the whole. 



Most of the plants examined by me had smooth, flat leaves, 

 but two notable exceptions occurred. At Graignamanagh 

 wood, where very little sunlight could penetrate, one large 

 plant produced spotted leaves with pseudo-blisters, as described 

 by Mr. Colgan, coinciding with the black markings, but with 

 the prominence in this case appearing on the under-surface. 

 A spotted plant close by this had perfectly flat leaves. At 

 Portumna a plant of the ivwiaculate form bore similar pseudo- 

 blisters, with the elevations on the upper surface of the leaves 

 without any dark markings whatever. I could not discover 

 that the circumstances under which these two plants grew 

 differed in an}^ w^ay from those of the numerous specimens of 

 normal form growing alongside. 



The dark spots which appear on the leaves of several of our 

 British orchids, i.e., Oixhis mascula, O. viactilatasind. O.latifolia 

 seem to be of the same nature as those of Arum viaadatuvi, 

 and each of these species occurs with spotted and unspotted 

 forms growing in the same localities, and under apparently 

 similar conditions ; but further observation is necessary before 

 expression is given as to their relative frequency. 



Cork. 



