104 THE JOURNAL OF BOTANY 



spiral bands on the threads running in the reverse direction from 

 that in Trichia, i. e., they pass from the right below to the left 

 above when the thread is seen horizontally. This is the first 

 instance that I have seen of reversed spiral bands in any species 

 of the Mycetozoa ; the nearest approach is in Oligonema flavidmn 

 Peck, where the rows of minute warts that are studded over the 

 capillitium are often arranged to form rows passing round the 

 threads in the reversed spiral direction. Of the cause or possible 

 significance of such a reversal we know nothing. Its exceptional 

 occurrence draws our attention to the constancy with which the 

 usual type of spiral occurs. 



Aecyria denudata (L.) Sheldon. A large development of 

 crimson sporangia was found on a decaying spruce log. 



A. INCARNATA Pors. Developed indoors from white Plas- 

 modium found on a spruce stump. 



A. NUTANS (Bull.) Pers. Found emerging as a mass of 

 creamy-white plasmodium from a spruce stump, and matured 

 indoors. It was probably slightly injured when it was cut off the 

 stump, for, although the spores are normal, the capillitium is 

 irregular, varying from 5 to 8 /x diam., and studded all over with 

 stout conical spines. 



Perich^na vermicularis (Schwein.) Eost. Abundant on and 

 inside hollow Cirsium scapes on the alps. The slender buff 

 sporangia form simple or net-like plasmodiocarps ; the plasmo- 

 dium, instead of being watery-white, as we had previously seen 

 it, is rosy-red; the veins of bright red sclerotium were conspicuous 

 when the stalks were split open and examined. 



Margarita metallica (Berk. & Br.) Lister. Found twice on 

 spruce wood ; the sporangia were either solitary or clustered. 



Dianema corticatum Lister. Fairly abundant on decaying 

 roots and stumps of spruce, both in the rosy plasmodium stage 

 and as mature sporangia. 



Prototrichia metallica (Berk.) Massee. Two sporangia 

 found on decaying spruce roots ; both are brilliantly iridescent 

 and mounted on brownish-yellow stalks about 1 mm. high ; the 

 colour of the spores in mass is olive-brown, instead of the usual 

 pink or brownish-pink of freshly formed spores. 



After we left Arosa, the Hon. Terence Bourke and Miss 

 Jasmine Bourke kindly sent me collections of Mycetozoa made 

 there by them during the month of August. 



Of the fifteen species which they found, the following five had 

 not been seen by us at Arosa, viz. : — 



Leocarpus fragilis (Dicks.) Eost. 



DiDYMiuM MELANOSPERMUM (Pcrs.) Macbr. 



CoMATRiCHA TYPHOiDES (BuU.) Eost. The typical form. 



Cribraria piriformis Schrad Several developments of per- 

 fectly developed sporangia, with spores varying in colour from 

 bright reddish-brown to purplish-brown when seen in mass. 



Arcyria FERRUGiNEA Sautcr. 



