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Acremonium cajani sp.nov. (Hyphomycetes) from pigeon pea
Notes and brief articles ACREMONIUM CAJANI SP.NOV. (HYPHOMYCETES) FROM PIGEON PEA BY B. L. BRADY
74 Forest Road, Kew, Richmond, Surrey, TW93BZ, U.K. Acremonium cajani is described and illustrated from dead twigs of Cajanus cajan from Sierra Leone collected between 1950 and 1959, mostly by F. C. Deighton. It is distinguished by the large unicellular hyaline conidia.
Acremonium cajani sp.nov.
(Fig. 1)
Fungus ad classem Hyphomyceturn pertinens, omnino hyalinus, habet mycelium superficiale, et conidiophoras mononematosas, erectas, septatas, 140-200 Jtm longas, ad fundamentum 5--6Jtm latas, et ad apicem 4-5 Jtm latas. Cellulae conidiogenae sunt simplices, collare absenti, 28-48 Jtm longae et 5--6Jtm latae. Conidia aseptata sunt, ellipsoidea, symmetrica, 10-22 x 8-12 Jtm in capitulis mucidis connexa. Chlamydosporae absunt.
Holotypus in cortice ramorum Cajani cajan (L.) Millsp., Njala, Kori, Sierra Leone, 25 February 1954, F. C. Deighton M 5759(A), 1M1 56274 a.
Mycelium surface of
pm wide, ramifying over the the twigs. Conidiophores erect, 140-200 pm long, 5-6 pm wide at the base, tapering to 4-5 pm at the tip, 4- to 6-septate, mostly unbranched, rarely once branched, arising in groups from the prostrate mycelium. Conidiogenous cell the distal cell of the conidiophore, little differentiated from the proximal cells except in function, producing holoblastic conidia singly and proliferating enteroblastically, apex periclinally thickened, cellarette absent, 28-48 x 5-6 pm. Conidia aseptate, ellipsoidal, symmetrical, hyaline, smooth-walled, 10-22 x 8-12 pm, after secession collecting at the tip of the conidiogenous cell in a group or 'head' of 2-4 cells. Chlamydospores absent. Teleomorph unknown. A living culture on potato agar was obtained from the type material in 1954 but this did not survive, being preserved in the dried state only. 6-10
Additional specimens examined: All on Cajanus cajan, Sierra Leone. Newton (Colony), 16 Nov. 1950, F. C. Deighton M3691, 1M1 44893; Rokupr (Magbema), 26 Feb. 1951, F. C. Deighton M 3963, 1M1 45919; Njala (Kori), 8 Mar. 1953, F. C. DeightonM 5178, 1M1 52362; Njala(Kori) 4 Feb. 1959,C. T. Pyne M 6569, 1M1 76627.
Fig.
1.
Trans. Br. mycol. Soc. 87 (3), (1986)
The conidia of this species are much larger than any nonseptate conidia produced by the hyaline species of Acremonium recognized by Gams (1971), although several of those species with dark conidia placed by Gams in his section Gliomastix have similarly large conidia. Some species with hyaline conidia in the section Nectrioidea of Gams have conidia approaching A. cajani in size, but they are usually once septate. Dingley (1957), when growing cultures from ascospores of Hypocrea citrina (Pers.) Fr., obtained a 'Cephalosporium' with large, smooth, hyaline conidia which she illustrated as collecting in 'heads', but these conidia measured 7-11 x 3-4 pm and were thus considerably smaller than those described here; there were also arthrospores and chlamydospores present. Printed in Great Britain
Notes and brief articles The author thanks Mr F. C. Deighton for suggesting the study of this material and the Director of the CAB International Mycological Institute for providing facilities.
Trans. Br. mycol. Soc. 87 (3), (1986)
REFERENCES
DINGLEY,
J. M.
(1957). Life history studies in the genus
Hypocrea Fr. Transactions of the Royal Society of New Zealand 84,689-693. GAMS, W. (1971). Cephalosporium-artige Schimmelpilze (Hyphomycetes). Stuttgart: Fischer.
Primed in Great Britain
74 Forest Road, Kew, Richmond, Surrey, TW93BZ, U.K. Acremonium cajani is described and illustrated from dead twigs of Cajanus cajan from Sierra Leone collected between 1950 and 1959, mostly by F. C. Deighton. It is distinguished by the large unicellular hyaline conidia.
Acremonium cajani sp.nov.
(Fig. 1)
Fungus ad classem Hyphomyceturn pertinens, omnino hyalinus, habet mycelium superficiale, et conidiophoras mononematosas, erectas, septatas, 140-200 Jtm longas, ad fundamentum 5--6Jtm latas, et ad apicem 4-5 Jtm latas. Cellulae conidiogenae sunt simplices, collare absenti, 28-48 Jtm longae et 5--6Jtm latae. Conidia aseptata sunt, ellipsoidea, symmetrica, 10-22 x 8-12 Jtm in capitulis mucidis connexa. Chlamydosporae absunt.
Holotypus in cortice ramorum Cajani cajan (L.) Millsp., Njala, Kori, Sierra Leone, 25 February 1954, F. C. Deighton M 5759(A), 1M1 56274 a.
Mycelium surface of
pm wide, ramifying over the the twigs. Conidiophores erect, 140-200 pm long, 5-6 pm wide at the base, tapering to 4-5 pm at the tip, 4- to 6-septate, mostly unbranched, rarely once branched, arising in groups from the prostrate mycelium. Conidiogenous cell the distal cell of the conidiophore, little differentiated from the proximal cells except in function, producing holoblastic conidia singly and proliferating enteroblastically, apex periclinally thickened, cellarette absent, 28-48 x 5-6 pm. Conidia aseptate, ellipsoidal, symmetrical, hyaline, smooth-walled, 10-22 x 8-12 pm, after secession collecting at the tip of the conidiogenous cell in a group or 'head' of 2-4 cells. Chlamydospores absent. Teleomorph unknown. A living culture on potato agar was obtained from the type material in 1954 but this did not survive, being preserved in the dried state only. 6-10
Additional specimens examined: All on Cajanus cajan, Sierra Leone. Newton (Colony), 16 Nov. 1950, F. C. Deighton M3691, 1M1 44893; Rokupr (Magbema), 26 Feb. 1951, F. C. Deighton M 3963, 1M1 45919; Njala (Kori), 8 Mar. 1953, F. C. DeightonM 5178, 1M1 52362; Njala(Kori) 4 Feb. 1959,C. T. Pyne M 6569, 1M1 76627.
Fig.
1.
Trans. Br. mycol. Soc. 87 (3), (1986)
The conidia of this species are much larger than any nonseptate conidia produced by the hyaline species of Acremonium recognized by Gams (1971), although several of those species with dark conidia placed by Gams in his section Gliomastix have similarly large conidia. Some species with hyaline conidia in the section Nectrioidea of Gams have conidia approaching A. cajani in size, but they are usually once septate. Dingley (1957), when growing cultures from ascospores of Hypocrea citrina (Pers.) Fr., obtained a 'Cephalosporium' with large, smooth, hyaline conidia which she illustrated as collecting in 'heads', but these conidia measured 7-11 x 3-4 pm and were thus considerably smaller than those described here; there were also arthrospores and chlamydospores present. Printed in Great Britain
Notes and brief articles The author thanks Mr F. C. Deighton for suggesting the study of this material and the Director of the CAB International Mycological Institute for providing facilities.
Trans. Br. mycol. Soc. 87 (3), (1986)
REFERENCES
DINGLEY,
J. M.
(1957). Life history studies in the genus
Hypocrea Fr. Transactions of the Royal Society of New Zealand 84,689-693. GAMS, W. (1971). Cephalosporium-artige Schimmelpilze (Hyphomycetes). Stuttgart: Fischer.
Primed in Great Britain