REMARKABLE PHANEROGAMOUS PARASITES. 309 
which. mimic the host appear to be confined to one species, or to 
very closely allied species ; but on this point more exact infor- 
mation s required. It is certain, however, that Loranthus 
pendulus not only grows on various species of Acacia, Eucalyptus, 
and Santalum, plants having very similar foliage, but it also 
grows on various species of the exceedingly dissimilar genus 
Casuarina. Although I am not able to show you specimens 
actually attached to the host-plant, I believe that the authorities 
are implicitly reliable. 
I will now return to the genus Viscum, and to what I believe 
is the smallest species, Viscum minimum, Harv. It grows on the 
‘Cereus-like species of Euphorbia, and perhaps exclusively on the 
E. cereiformis, a species having itself a close resemblance to the 
genus Cereus, except in the arrangement ofthespines. This tiny 
parasite is scarcely a quarter of an inch high, and the most fully 
developed plants have only three flowers, two lateral and one 
terminal, sueceeded by berries which individually are many times 
larger than the plant bearing them *. Viscum Crassule, Eckl. & 
Zeyh., is another interesting South-African species, concerning 
which I find the following note accompanying a speciinen in the 
Kew Herbarium presented by Professor MacO wan, Government 
Botanist, Cap Colony :—" This rare Viscum grows plentifully 
between Cockhuis Drift on Vischrivier and Patryshoogte, but 
invariably on Portulacaria afra, Jacq., whose younger leaves it 
strikingly resembles. But for the scarlet berries, few save botanists 
would detect it. The large arborescent Crassula portulacea, Lam., 
is abundant in the same locality; but though I have examined 
hundreds of trees the Viscum has never occurred uponany. Some 
sharp-eyed Boers say it grows on the Groot Noors Doorn; but this 
may be a remembrance of the large scarlet-berried V. minimum.” 
I might go on multiplying instances in which strong resem- 
blances between the foliage of the host and the parasite exist ; but 
I will only put forward one more. This is the Indian Loranthus 
longiflorus, Desr., growing on the Mango. Compare the parasite 
and host as represented in an unpublished drawing of the Loran- 
thus and the ‘ Botanical Magazine’ figure of the Mango, t. 4510. 
As an illustration of the diversity in size of the flowers, I call 
your attention to the figure of Loranthus macranthus (Hooker's 
* A still more diminutive parasite of this order is Arceuthobium minutis- 
simum, which grows on the branches of Pinus excelsa in North-west India. The 
flowers are practically sessile on, or even almost embedded in, the bark. 
