Bheemamyces, a new genus of the
family Asterinaceae (Ascomycetes)
V.B. Hosagoudar 1, A. Sabeena 2 & M.C. Riju2
1,2 Tropical
Botanic Garden and Research Institute, Palode, Thiruvananthapuram, Kerala 695562, India
Email: 1 vbhosagoudar@rediffmail.com
Date of publication (online): 26
November 2010
Date of publication (print): 26 November
2010
ISSN 0974-7907 (online) | 0974-7893
(print)
Editor: Richard Mibey
Manuscript details:
Ms # o2583
Received 23 September 2010
Finally accepted 09 November 2010
Citation: Hosagoudar,
V.B., A. Sabeena & M.C. Riju(2010). Bheemamyces, a new genus of the family Asterinaceae(Ascomycetes). Journal of
Threatened Taxa 2(12): 1323-1324.
Copyright: © V.B. Hosagoudar, A. Sabeena & M.C.Riju 2010. Creative Commons Attribution 3.0 Unported License. JoTT allows
unrestricted use of this article in any medium for non-profit purposes,
reproduction and distribution by providing adequate credit to the authors and
the source of publication.
Acknowledgements:We
thank Dr. A. Subramoniam, Director, Tropical Botanic
Garden and Research Institute, Palode for the
facilities and Dr. R. Ansari, Managing Director (Retd.), Malabar Botanic Garden, Kozhikode for providing the
facilities during the collection trip.
For figures, image -- click here
During a survey of foliicolous fungi in the Western Ghats region of Kerala
State, authors came across infected leaves of Argyreianervosa,
collected from the Malabar Botanic Garden, Kozhikode. The fungus revealed brown mycelium with the
lateral appressoria and stellatelydehisced orbicular thyriothecia. These are the characters of the genus Asterina. In addition to these typical characters, the
mycelia originated from the main hyphae, lifted
slightly above the host surface, appearing like a ‘whip’, possessing
intercalary and sub intercalary or sub lateral appressoria,
making it distinct from the genus Asterina. Because of
the intercalary appressoria, it can not be placed
under the genus Asterolibertiabecause it also possesses the characters of the genus Asterina, having lateral appressoria (Muller & Arx 1962; Arx & Muller 1975; Hosagoudaret al. 2001). Hence, to
accommodate such fungi, the genus Bheemamyces is proposed here. This is a transitional genus between the
genera Asterina and Asterolibertia.
Bheemamyces
V.B. Hosagoudar, gen. nov.
The name Bheema is derived from the brave personality of Pandavas from the epic Mahabharata.
Coloniae foliicolae,brunneae, ramosae, septatae, appressoria uterque intercalaris vel lateralis, saepe hyphae formansannulus. Thyriothecia orbicularis,stellatim dehiscentes ad
centre; asci globosi, octospori; ascosporae conglobatae, brunneae, uniseptatae.
Colonies foliicolous, brown, branched, septate,appressoria both intercalary and lateral, often form mycelial ring. Thyriothecia orbicular, stellatelydehisce at the centre; asci globose,octosporous; ascospores conglobate, brown, uniseptate.
Type species Bheemamyces argyreicola sp. nov.
Bheemamyces argyreicola sp. nov.
(Image 1, Figs. 1 & 2)
Material examined: 04.xi.2009, on leaves of Argyreianervosa (Burm. f.) Bojer. (Convolvulaceae),
Malabar Botanic Garden, Kozhikode, Kerala, India, coll. A. Sabeena& M.C Riju, TBGT 4324 (holotype). Isotype is in HCIO,
New Delhi.
Coloniae epiphyllae,
dense vel arte dispersae,
ad 2mm diam., saepe confluentes. Hyphaebi-typus: subrectae vel anfractuae, irregulariter acuteque vel laxe ramosae,laxe vel arte reticulatae, cellulae 12-32 × 4-5μm. Appressoria dispersa, alternata vel unilateralis,unicellularis, ovata, oblonga, globosa, integra, angularis vel sublobata, 5-17 × 5-10 μm hyphae secundus exorioratus a hyphae primariae, angustatae, curvulae, leniter elevatae a hostus surfacalis et acutus ad apicem. Appressoria intercalaribus,sub intercalaribus et lateralis. Annulae hyphales irreggularibus et appressoria nulla. Appressoria intercalaria et sub intercalaria, ovala vel globosa, loculum hyalinae ad centre persistantis,
5-10 × 5-7 μm. Thyriothecia dispersa vel connata, orbicularis, stellatim dehiscentes ad centre, ad 90 μmdiam., margine crenatae vel fimbriatae, hyphae fringiorum rectae, flexuosae vel anfractuae; asci globosi, octospori,
32-35 μm diam.; ascosporae brunneae, conglobatae, uniseptatae, constrictus ad septatae, 15-25 × 7-12 μm, parietus glabrus, confestatim germinatae.
Colonies epiphyllous,
densely or closely scattered, up to 2mm in diameter,
often confluent. Hyphae of two types: substraight to crooked, branching irregular at acute to
wide angles, loosely to closely reticulate, cells 12-32 × 4-5 μm. Appressoria scattered,
alternate to unilateral, unicellular, ovate, oblong, globose,
entire, angular to sublobate, 5-17 × 5-10 μm. The second type of hyphaeoriginated from the main hyphae, narrower, curved, slightly elevated from the host surface and sharply pointed
at the tip. These hyphae possess intercalary, sub
intercalary and lateral appressoria. Hyphal rings are
formed randomly but are devoid of appressoria. The
intercalary and sub intercalary appressoria oval to globose, having a central slightly hyaline spot, 5-10 × 5-7μm. Thyriotheciascattered to connate, orbicular, stellately dehisced
at the centre, up to 90μm in diameter, margin crenate to fimbriate, fringed hyphaestraight, flexuous to crooked; asci globose, octosporous, 32-35 μm in diameter; ascosporesbrown, conglobate, uniseptate,
constricted at the septum, 15-25 × 7-12 μm, wall
smooth, readily germinated.
Bheemamyces argyreiae (Hansf.) Hosag., comb. nov.
Asterina argyreiae Hansf., Reinwardtia 3: 130, 1954.
Hansford (1954) has
also mentioned peculiarity about the appressoria in Asterina argyreiae Hansf. However, the presence of intercalary and sub intercalary appressoria does fit this taxoninto the genus Bheemamyces.
References
Arx, J.A.V. & E. Muller (1975). A re-evaluation of
the bitunicate ascomycetes with key to the families and genera. Studiesin Mycology 9: 1-159.
Hansford, C.G. (1954). Some Microthyriales and other fungi from Indonesia. Reinwardtia 3: 113-144.
Hosagoudar, V.B., T.K.
Abraham & C.K. Biju (2001). Re-evaluation of the family Asterinaceae. J. Mycopathol. Res. 39: 61-63.
Muller, E. &
J.A.V. Arx (1962). Die Gattungen der didymosporen Pyrenomyceten. Beitr. Kryptogamenfl. Schweiz 11: 1-922.