Macrosporium parasiticum, Thurn . 1 3 
not be out of place here to state concisely the results of 
my examination of Thiimen’s original specimens of Macro- 
sporium parasiticum^ . They are not so much advanced in 
growth as the Bermuda specimens ; still the spores are well 
matured. Their size and shape correspond very closely with 
those of the latter. They have also the characteristic minute 
projections over their surface, though this characteristic is not 
mentioned in his description. The number of tranverse septa 
is usually five to seven. I have not been able to find a spore 
which has so many as ten septa. The fertile hyphae corre- 
spond exactly in all essential characters in both specimens (Fig. 
16). It is beyond doubt that the Bermuda Macrosporium is 
identical with the European form described by Thumen. 
From the preceding account of the development of the 
M acrosporium parasiticum it will be clearly seen that its 
ascosporic stage is a species of Pleospora ; and furthermore, 
that it corresponds so closely in every essential character to 
the descriptions and figures of Pleospora herbarum (Pers.), 
Rabenh., given by Berlese 2 in his recent monograph, and also 
to those by Tulasne 3 , von Niessl 4 , and Winter 5 , as to leave 
little doubt in regard to their identity. The comparison 
with the authentic specimens of Pleospora herbarum in the 
European exsiccati further confirmed the point in question 6 . 
1 F. de Thiimen, Mycotheca Universalis, Cent. vii. n. 667, Klosterneuburg, 1887. 
Accompanied by the following description : — ‘ Maculas atras formans ; hyphis 
abbreviatis breviarticulatis, ramosis, ramis brevibus, griseo-fuscis ; conidiis oblongo- 
ovoideis vel ovoideo-rotundatis vel clavatis, 6-10 septatis, ntrinque obtusis, 
42-48 x to-i6, fuscis. Hab. in foliis vivis vel languidis Allii Cepae , praecique 
in Peronospora Schleideniana parasitans. Bayreuth Bavariae.’ 
2 A. N. Berlese, Monografia dei generi Pleospora , Clathrospora e Pyrenophora , 
in Nuovo Giornale Bot. Ital. vol. xx. 1888, No. 1, p. 91, tav. v. f. 2-6. 
3 L. R. et C. Tulasne, Selecta Fungorum Carpologia, tom. ii. 1863, p. 261, 
tab. xxxii-xxxiii, Fig. 10-14. 
4 G. von Niessl, Notizen ueb. neue u. krit. Pyrenomyceten, p. 29, tab. iv, Fig. 
14, 1876. 
5 G. Winter, Rabenh. Kryptog. Flora, Bnd. I. 1885. Pilze, ii. p. 504, Fig. on 
p. 408. 
6 Some of the specimens on the onion-plants were carefully examined and com- 
pared. One published by Cesati and de Notaris under the name of Pleospora Allii 
in Herb. Critt. Ital. ser. ii. fasc. xiii. n. 644, was mostly too young. I saw one or 
two asci, whose spores were somewhat advanced towards maturity. In some of 
