554 EMERSON :: MACROPHOMA AND DIPLODIA 
this way the Macrophoma spores are stained light purple and the 
rest of the fungus brown, while the leaf-tissues become brown 
or red. 
The Macrophoma form of this species was described originally 
by Cooke in Grevillea (5: rot), under the name Sphaeropsts pal- 
marum, as follows: 
“Erumpens. Peritheciis subglobosis, applanatis, demum su- 
perne detectis, atris; sporis ellipticis, hyalinis, intus granulosis. 
On petioles and midribs of Cocos nucifera. Demerara. Spores 
.02 X .012 mm. Perithecia rather large, splitting the cuticle.” 
On the next page of the same paper Cooke thus describes the 
Diplodia form under the name Diplodia epicocos : 
“ Sparsa vel subgregaria. Peritheciis demum superficialibus vel 
semi-immersis, globosis, atris; sporis ellipticis, uniseptatis, con- 
strictis, brunneis. On dead young leaves of Cocos nucifera. Spores 
022 X .OI~.012 mm. Externally resembling a small Sphaeria 
of the section Denudatae.”’ 
In the following description I have included both stages: 
Pycnidia buried to erumpent, sometimes becoming superficial, 
black, carbonaceous, opaque, cells indistinct, 130-250 in diam- 
eter, subgregarious, globose or conical at the mouth; Macrophoma 
spores elliptical or ovoid, obtuse, hyaline, granular, 20-25 x 10 i 
Diplodia spores elliptical, one septate, brown, obtuse, sometimes 
slightly constricted, 20-25 x 10; spores borne on simple hya- 
line sporophores 12-15 by 2-3 », hyaline and brown spores in the 
same way, without any order; mycelium of contorted, irregular, 
septate threads, brown near the pycnidia and when old. 
Explanation of plate 25 
Fig. 1. Three pycnidia breaking through the epidermis of cocoanut spathe. 
Seen from above. >< 44. 
The single pycnidium from Fig. 1. >< 44. 
Fig. 3. Macrophoma and Diplodia spores. >< 280. 
Fig. 4. Chlamydospores sprouting. >< 192. 
Fig. 5. Longitudinal section through pycnidium in leaf, 192. 
Fig. 6. Macrophoma and Diplodia spores from a hanging drop culture. ahnier 
280. 
P 
x 2 
Fig. 7. Penilex to Fig. 5, more highly magnified and somewhat diagrammatic. 
Fig. 8. Longitudinal section of opcineien growing above wasting < afe- 
Figs. 3, 6 and 7 are drawn with a camera lucida. 
