which branch and grow through the skin and into the flesh and tissue of the creature. 

 In the blood these hyphae produce long cylindrical bodies called gonidia, that en- 

 large and divide into cells and develop to such an extent that they kill the insect. 

 After the death these fungal hyphae continue to grow and absorb the tissue of the 

 host until finally the skin of the host alone remains intact, the internal soft tissue of 

 the host being replaced by the fungal hyphae, and in this condition is called a scle- 

 rotium. A section of a sclerotium is a uniform structure of interwoven hyaline, 

 fungal hyphae showing no trace of the form of the internal organs of the host. It is 

 said that traces ot the intestines sometimes remain. 



The sclerotia of most species of Cordyceps, perhaps all of them, produce in 

 their life circle two different kinds of fruiting bodies which have little resemblance 

 to each other. First, there is produced a conidial condition, when the spores are 

 borne direct on the hyphae. This conidial development 

 is either a loose, powdery (mildew-like) membrane over 

 the host (Fig. 615) known as Botrytis, or it is a definite 

 stipitate body (Fig. 613), called Isaria. Second, the 

 sclerotium produces usually a club-shape body bearing 

 . perithecia (Fig. 614) and ascus spores, which is the true 

 E%g EBflP Cordyceps as previously described. The correlation of 

 ^JEtf^P* f *^^~VF the Isaria and Cordyceps forms is known only as to a 

 very few species. Isaria farinosa (Fig. 613), which is the 

 Fig- 61 5. only common Isaria we have in the United States, is 



known to be the conidial fruiting body of Cordyceps 



militaris (Fig. 614). In Brazil there are species which bear the Isaria and Cordyceps 

 fruit concurrent, and in Ceylon is a species of Cordyceps where the upper part of 

 the club bears conidial spores, and the lower part the perithecia. Usually, however, 

 the Cordyceps form is supposed to be produced some months after the Isaria form. 

 The Isaria form of none of the Australian species is known, excepting "Cordyceps 

 Sinclairii" (.Fig. 626), and that is only known from the Isaria fruit. 



THE CORDYCEPS SPECIES OF AUSTRALASIA. 



We present the usual formal description of the known Australasian species and 

 a photograph of each made from authentic material. Specimens can be determined 

 from the photographs much easier than from the descriptions, but it must be borne 

 in mind that the specimens shrink in drying and the fresh specimens are thicker 

 than the dried. 



CORDYCEPS ROBERTSII (Fig. 616). Fertile club slender, 

 2^ to 5 inches long, 3-4 mm., thick, acute, densely covered with the 

 superficial perithecia, which reach the apex of the stem. Stem pro- 

 ceeding from near the thorax of the caterpillar, slender, 2 to 6 inches 

 long, 2-3 mm. thick. Perithecia small, densely packed around the 

 central axis, free, easily rubbed off from the axis. 



Popular accounts were written of the fungus in the early days 

 under the name of plant-caterpillar. It was eaten by the natives. 

 It is the most slender of the large species, and from the accounts, is 

 dark, almost black when fresh. The host, according to Gray, is the 

 larva of Charagria virescens, a Lepiodoptera in the perfect state. 

 These insects pass the first two states as larva and pupa, in the earth 

 around the roots of tree ferns. The larva become infected with the 

 spores of the Cordyceps and are killed before reaching the pupal state. 

 Each sclerotium sends up but a single fruit. 



Cordyceps Robertsii was named and figured by Hooker in Icones 

 Plant, vol. 1 (1837), t. 11, and later by Berkeley (1840) in Hooker's 

 Journal of Botany, Vol. 3, page 77, t. 1, fig. A. It has been known as 

 Cordyceps Robertsii in all English (except one), French and general 



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