1084 REPORT—1885. 
O. Alexandre. Plant in flower, no aerial roots on plant. 
O. hystrix. Plant with many pseudobulbs, few aerial roots, has not flowered 
for more than two years, no trace of mycelia. 
O. Rossii majus. Plant with many pseudobulbs, few aerial roots; examined 
five months after end of flowering period, which extended over ten weeks. No 
trace of mycelia. 
O. veaillarium. Leafy plant with pseudobulbs, few aerial roots; examined 
three weeks before flowering. No trace of mycelia. 
O. cariniferum. Plant similar to last, will flower in spring. No trace of 
mycelia. 
i Dendrobium nobile. Plant in flower, many old and a few new aerial roots. No 
‘trace of mycelia. 
D. Cambridgeanum (Cantabrigense ?). Many old and few new aerial roots, no 
trace of mycelia. Plant not in flower. 
D. Farmerit. Plant not in flower, several vigorous aerial roots. No trace of 
mycelia. 
D, tortile roseum. Plant like preceding, similar results. 
D, Faleonerit. Plant examined three months after flowering, many aerial roots 
old and new, no trace of mycelia. 
D. crassinode Barberiana. Plant not in flower, few roots. No trace. 
D. primulinum giganteum. Plant strong and vigorous, few aerial roots; no 
trace of mycelia. 
D. bigibbum. Plant has not flowered for two years, has been kept dry, a few 
new aerial roots springing from apparently withered stems. No trace. 
D. formosum giganteum. Plant with few aerial roots. No trace. 
D. aggregatum majus. No trace of mycelia one month after period of 
flowering. 
Aerides odoratum. Strong, healthy plant with many large aerial roots. No 
‘trace of mycelia, 
A, virens. No trace one month after flowering. 
A. Lobbit. Examined two months before period of flowering, many thick 
vigorous roots. No trace. 
Saccolahium ampullaceum, Plant with long, thick healthy aerial roots, ex- 
amined three months after flowering. No trace of mycelia. 
S. Llumet. Similar in growth to last. No trace. 
S. guttatum. No trace three months before period of flowering. 
Cypripedium Laurentium. Plant with thick aerial roots, examined one month 
after flowering. No trace. 
Ada aurantiaca. Examined four months after flowering. No trace of mycelia. 
Angrecum caudatum. Plant with long, thick, fleshy aerial roots, examined 
just before flowering ; no trace. 
Cypripedium Veitchi. Plant in flower ; no trace. 
C. Drewt. Plant in flower; no trace. 
Helcia sanguinolenta. Plant not in flower. No trace of mycelia. 
Dendrobium filiforme. Plant in full flower, few aerial roots. No trace of 
mycelia. 
Cattleya Laurenceiana. Plant strong and vigorous, mycelia abundant in aerial 
roots. 
C. trienne, Like last, very strong development of mycelia. 
Terrestrial Orchid. 
Disa grandiflora. Plant large, healthy, in full flower. No trace in any under- 
ground roots, No aerial roots. 
The evidence afforded by these epiphytic orchids as to the nature and function 
of the fungi growing in them is of a somewhat conflicting character. Before 
‘discussing that evidence it will be necessary to glance at the structure of an aerial 
root. 
At the growing apex of each aerial root is a glaucous bright green portion 
